The eccentric pop star celebrated turning 25 with her family and close friends - including her boyfriend Luc Carl, Kate Hudson, Fergie, Cindy Crawford and Adam Lambert - at Los Angeles` LA Cita Mexican restaurant, and was showered with gifts, including the saucy present.

A source said: "Gaga got diamonds from one anonymous guest while another had a sex doll made for her - its piece de resistance was a huge penis."

The singer hired out the whole bar and was also treated to a berry-covered , Jack Daniel`s whiskey and champagne.

After she cut the cake the star, whose real name is Stefani Germanotta, took to the stage for a live performance of songs by Madonna and Motley Crue, as well as her own hit `Born This Way`, with the restaurant`s Mariachi band.

An onlooker told UsMagazine.com: "She was onstage for most of the night performing for all her friends. No one knew she was going to go up there and perform with them, I think she just loves to be on stage and doing what she does so well."

Another guest of the wild bash was Gaga`s mum Cynthia, who was reportedly left blushing by her daughter`s wild antics.

The spy said: "Gaga, who treated her tequila-swigging guests to a tipsy rendition of `Born This Way` backed by the restaurant band, was on serious form.

"Adam Lambert got a little over-excited while dancing and bashed his head on the ceiling. And Gaga`s mum Cynthia looked red-faced at times - she kept muttering, `Stefani!` under her breath."
sections: Celebrities