Hollywood Life: Justin Bieber serenades Selena Gomez with 'My Girl'

On-again, off-again couple Justin Bieber and Selena Gomez apparently had a romantic evening together at the Montage Beverly Hills hotel on Friday, and it was all caught on camera.

An Instagram by a fan shows Bieber, 21, singing "My Girl" to Gomez, 23, as she looks on.

Lindsay Cavanaugh, who called the moment "pure magic," posted three videos of the impromptu serenade, and a photo with Bieber and her friends taken by Gomez.

Cavanaugh wrote on her first post that she was "having a drink at an empty hotel bar and Justin Bieber appears out of nowhere and begins to sing on the piano."

In the Instagram video posts, the Canadian pop star sings the The Temptations hit to Gomez and also a slowed-down version of his new song, "Sorry."

Cavanaugh also posted that Bieber "asked to sit at our table to chat, so impressed by the kindness (and realness!) of this guy tonight. Now a #belieber."

Kate Beckinsale is back on the market again: The "Underworld" star has separated from her director husband Len Wiseman, according to People magazine.

The move comes after Wiseman was spotted with 24-year-old model C.J. Franco at Los Angeles hot spot The Nice Guy on Nov. 17. He was not wearing his wedding band, sparking rumors that he and Beckinsale were no longer together. The couple, both 42, were married in May 2004.

Do you think recently reunited couple Kylie Jenner and rapper Tyga will stay together or split again? Go to hollywoodlife.com and let us know.