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Lady Gaga was among the guests at a $35,800 per couple Obama fundraiser tonight at the home of Facebook’s Chief Operating Officer Sheryl Sandberg and David Goldberg in Atherton, Calif.

At the event, which took place under a tent in Sandberg’s yard, Gaga reportedly wore a black dress scalloped high plunge back and high heels. Her blond hair was upswept, with black flowers and black veil sweeping down back of hair.

According to a source present in the tent fundraiser, Gaga asked a question during the Q&A. She first thanked the president for what he’s accomplished, then read from what she said was a letter from a fan about the suicide of another fan who had been subjected to bullying.

She thanked Obama for hosting his anti-bullying conference with Michelle Obama, and then made a general plea to everyone in the room, including the president, to do what they can to prevent bullying.

Obama thanked her, spoke about his administration’s anti-bullying campaign, and then more generally about the importance of values and who we are as Americans.

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Before the dinner, Gaga came through the photo line with her manager. She and Obama reportedly spoke for two minutes, with many others in the room.

Gaga’s attendance at the fundraising event comes after the singer tweeted that she would be meeting the president and intended to discuss youth bullying with him in relation to the suicide of Jamey Rodemeyer, the 14-year-old student who took his own life last week after years of bullying.

“I am meeting with our President. I will not stop fighting. This must end. Our generation has the power to end it. Trend it #MakeALawForJamey,” the singer posted to twitter.

Gaga dedicated the song “Hair” to Rodemeyer at the iHeartRadio Festival this weekend in Las Vegas. The performance included a video tribute to Rodemeyer.

Earlier this week the pop singer, who Rodemeyer idolized, spoke out about the situation via twitter: “The past days I’ve spent reflecting, crying, and yelling. I have so much anger. It is hard to feel love when cruelty takes someones life.”

She added, “Bullying must become illegal. It is a hate crime.”

Rodemeyer took his life on September 18. In his final Twitter message he referenced Lady Gaga, writing “thank you for all you have done.”

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ABC News’ Tahman Bradley, Jake Tapper and Olivia Katrandjian contributed to this report.