The fundraiser was held under a tent at the residence of Facebook executive Sheryl Sandberg, according to US website Gossip Cop.
Around 70 guests paid up to $35,800 per couple to be part of the event.
President Obama reportedly spoke for eight minutes, but he apparently didn't directly acknowledge the 25-year-old singer.
Gaga's attendance to the event comes less than a week after she said she wanted to talk with Obama about anti-bullying legislation following 14-year-old Jamey Rodemeyer's suicide.