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R. KELLY’S TRIPLE PLAY

R&B star R. Kelly engaged in three-way sex sessions with an underage girl and another woman on at least three occasions – including double-teaming the teen on a basketball court, a key prosecution witness said yesterday.

In explosive testimony before a packed Chicago courtroom, Lisa Van Allen claimed that she, Kelly and the 13-year-old girl engaged in threesomes over two years.

On one occasion in 1999 – following an awards ceremony at which Kelly had been honored – the Grammy-winner videotaped himself, Van Allen and the teen having sex on a black futon set up on his private basketball court, she said.

“He took up his camera and we took off our clothes and we all had sex again,” said Van Allen.

Kelly stopped filming after Van Allen, now 27, broke down in tears, she recalled.

“I didn’t want to do it,” she said. “[Kelly] stopped everything and we left.”

Kelly is charged with 14 counts of child pornography for allegedly videotaping him self having sex with the younger teen.

Kelly, 41, and the alleged victim have both denied being on the video and he has pleaded not guilty.

The singer, whose real name is Robert Sylvester Kelly, faces up to 15 years behind bars if convicted.

Van Allen said the video showing Kelly and the girl allegedly having sex, which was shown to jurors last month during opening arguments, was probably made in 1998 – the same year she had a threesome with them – because “they both looked exactly the same way.”

Van Allen said Kelly paid her $20,000 last year in return for a videotape of the singer participating in a threesome with her and the girl.

She also said Kelly carried a duffel bag with his homemade porn wherever he went.

“If we was at the [music] studio, it was in the studio with him. If he was at [the gym], it would be at [the gym] with him,” she said.

Van Allen, who is currently engaged and the mother of a 5-year-old girl, said she met Kelly in 1997, when she was 17.

She said they instantly became lovers and she moved from Atlanta to Chicago to be near him.

Van Allen testified that in 1998, Kelly took her to his then-Chicago home, where she met the younger teen, who has not been identified.

On that occasion, Kelly allegedly taped them having sex. Van Allen said Kelly told her the alleged victim was 16.

“He had a stand and . . . directed it toward where we were,” she said. “[Kelly] told us where to sit and basically what to do.”

On a third occasion, in 2000, Kelly, Van Allen and the girl romped again – this time in his trailer in Chicago during a video shoot, she testified.

clemente.lisi@nypost.com