She's obviously a massive fan, but Whitney Houston is apparently no longer welcome at Prince's concerts.
According to reports the singer has been banned from the pop star's future shows following her bizarre behaviour during his recent string of Los Angeles dates as part of the Welcome 2 America tour.
U.S. website TMZ reports that Whitney constantly badgered Prince's team to let her onstage, but was refused.
in a video, uploaded by a fan to YouTube last week, Whitney is seen giving a shaky performance with Prince on stage.
She sings a few lines and dances, before Prince takes the microphone back from her.
He then entreats the audience to applaud, before firmly leading Whitney to the stairs to leave the stage.
As she walks past the microphone she chants 'go Whitney'.
Another video uploaded by a fan shows Whitney and her daughter Bobbi Kristina dancing over-enthusiastically in the audience at one of Prince's shows.
Bobbi, 18, sings along to Prince's songs as her mother holds her in a tight embrace, smiling at her.
Other audience members in the front row are still sitting in their seats, some looking unimpressed by the celebrity entertainment.
Whitney is currently undergoing undergoing treatment for drug and alcohol addiction, her spokeswoman revealed on Monday.
The 47-year-old has voluntarily enrolled in an out-patient programme rather than a residential facility.
The programme allows Whitney to go out in public - providing she has a monitor.
Whitney admitted to using drugs during an interview in 2009 with Oprah Winfrey, and she completed a stint in rehab in March 2005.
She launched a comeback in 2009 after battling drug addiction and released I Look To You, her first studio album in seven years which topped the U.S. and charts in other countries.
Whitney's representative did not respond to a request for comment.