- Update: Whitney Houston's Funeral Will Be Televised, Kevin Costner Will Speak, Stevie Wonder & Aretha Franklin Will Sing -

Whitney Houston's funeral will be televised Saturday. Marvin L. Winans will give the eulogy. Aretha Franklin and Stevie Wonder are going to sing. It's also being reported that Kevin Costner will speak at Whitney Houston's funeral Saturday. Additional details of the funeral:

Update: CNN will televise Whitney's funeral. Coverage begins Saturday at 11AM Est. [R.I.P Whitney!]

Via CNN:

Actor Kevin Costner, who starred with Whitney Houston in the 1992 hit movie "The Bodyguard," will speak at her funeral on Saturday, according to a source with knowledge of the funeral plans.

The ceremony will also feature performances by Stevie Wonder and Aretha Franklin, who is Houston's godmother, the source said Thursday.

Houston's ex-husband, Bobby Brown, plans to attend as well, according to a source close to Brown, and then perform with his group New Edition that evening. Brown considers performing as therapy to get him through a difficult time, the source said.

Brown was openly emotional at a show in Mississippi on Saturday night following news of Houston's death, then pulled out of a performance in Nashville on Sunday night and flew to Los Angeles.

Brown will rejoin New Edition Thursday night for a performance in Upper Marlboro, Maryland, according to a New Edition publicist.

At the New Hope Baptist Church, the Newark, New Jersey, house of worship where Houston sang as a child, preparations were under way for the private, invitation-only event.

Houston's funeral will be broadcast Saturday:

On Thursday at the church, metal barricades were being erected around a tribute area in front, where fans left balloons, candles and photographs of the singer.

Inside, funeral directors met with members of the Newark police, who will provide security for the event, said police Sgt. Ronald Glover.

But Samuel DiMaio, Newark police director, told reporters Thursday his advice to fans and curious members of the public was to stay home and watch the ceremony on television, as they will not be able to get close to the church.

The service is expected to be made available for television and web streaming, Houston's publicist said.

A perimeter will be set up for four blocks in two directions, and two blocks in the other directions, DiMaio said. The closest the public will be able to get is a staging area two blocks away.

Because of the police perimeter, a large screen will not be erected outside the church for the public to view the service. The church had said earlier it hoped such a screen could be in place.

Authorities have no security concerns, DiMaio said, but the priority is protecting the privacy and safety of the family and invited guests.

New Hope Pastor Joe Carter said Thursday the service will be personal and dignified.

Asked how Houston's family is doing, Carter said, "They're holding strong."

Meanwhile, a steady stream of people drove by the church Thursday, some slowing down to snap pictures and others getting out of their cars to pose in front of the memorials.

Some fans said they are disappointed the family is not holding a public memorial for Houston, but others said they understood the family's wishes.

Houston, 48, was found dead in the bathtub of her suite at the Beverly Hilton on Saturday, hours before she was to attend a pre-Grammys bash at the Beverly Hills, California, hotel.

Houston's death certificate, filed Wednesday, listed her cause of death as "deferred," meaning a determination is delayed pending more information. Speculation has grown while authorities await the outcome of toxicology tests that could take weeks.

The anti-anxiety medication Xanax was among prescription drugs found in the room, the source said Thursday. Houston's family members and staff confirmed she used the medication, the source said, but investigators don't know whether she took it the day she died. No Valium or other drugs classified as benzodiazepines, or sedatives, were found in the room, according to the source.

Houston also had a prescription for the antibiotic amoxicillin, the source said, but "if taken as prescribed, it's not going to kill you."

When paramedics arrived in Houston's hotel suite, she was in the hotel room, not in the bathroom, the source said. "She was lying on the floor, wet, on her back" and had already been removed from the bathtub, according to the source.

"No one official ever saw her in the bathtub or the bathroom," the source said. "The assistant and a bodyguard reported to emergency personnel that Houston was removed from the tub."

Ed Winter, assistant chief coroner at the Los Angeles County Coroner's office, said earlier that while prescription medication was found in Houston's room, the amount was less than that usually present in overdose deaths.

Saturday, the day she died, Houston was seen drinking at the pool in the morning, although the source noted witnesses said her behavior did not appear erratic.

A singer who participated in an impromptu duet with Houston at a party Thursday night said Houston was not behaving erratically, but did have champagne.

"I didn't see someone who was high," Kelly Price told CNN's "Starting Point" on Monday. During the party, Houston took the stage unexpectedly and sang a hoarse rendition of "Jesus Loves Me" with Price.

The coroner's office has issued subpoenas seeking Houston's medical records and her prescriptions, Winter said Wednesday. Investigators are also contacting pharmacies where the prescriptions were filled, he said.

"I know there are reports that she maybe was drowned or did she overdose, but we won't make a final determination until all the tests are in," Winter said earlier. He ruled out foul play and said there were no injuries to Houston's body.

The prescriptions found in the room were in Houston's name, Winter told Lemon. By contacting the doctors, investigators are attempting to verify the prescriptions and find out if there were any more.

Several doctors have been contacted in California and other states, along with pharmacies, he said. All were cooperating.

"Everything is above board," Winter said. "So far, nothing looks criminal."

Houston visited a Beverly Hills ear, nose and throat specialist four days before she died, a source familiar with her visit said Wednesday.

Dr. Shawn Nasseri had treated Houston for throat and vocal problems for several years, said the source, who asked not to be identified because they are not authorized to speak publicly about it.

A close family friend told CNN Tuesday that Houston had not used "hard drugs" for several years, although she was taking medication for a throat infection and Xanax or a similar drug for anxiety and to help her sleep. The friend said Houston was also known to have a drink if she went out.

Gospel singer and pastor Marvin L. Winans will give the eulogy at the funeral at the request of Houston's mother, said New Hope Pastor Joe Carter.

Winans officiated Houston's 1992 marriage to R&B singer Bobby Brown, said Carter. The two divorced in 2007.

Asked why no public memorial service was planned, Winans told CNN's Anderson Cooper on Wednesday night the family didn't "want to have a parade."

"I don't think, knowing Cissy (Houston's mother) and the Houston family ... it was a matter of public or private as it was, 'This is my daughter, this is my sister, this is my mother, this is my friend and we want to do this with dignity.'"

Rest In Peace Whitney.