Find Out How Lady Gaga Spent Her 24th Birthday

Credit: Kevin Mazur/WireImage for MAC Cosmetics

Lady Gaga ended up in tears on her 24th birthday this Sunday.

After watching a nine-minute YouTube video made by fans, the singer Twittered, "I've never cried so hard in 24 years, from pure joy and unconditional love. Tears still streaming."

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She was presented with a giant cake by her dancers in the middle of a Sunday concert in Brisbane, Australia. The entire audience broke into "Happy Birthday."

PerezHilton.com, a few fans got a piece as they walked out of the show.

Gaga recently hired Steven Klein -- who has shot sexy magazine spreads featuring Brad Pitt and Angelina Jolie and Jennifer Aniston and Gerard Butler -- to direct her newest music video.