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The Boy Meets World alum and the Drop the Mic executive producer appeared with them. They had announced their engagement earlier that day. Baldwin is a co-host of Drop the Mic, while Mayer is a longtime friend of Karp's.
Baldwin, 21, and Mayer, 40, arrived at the restaurant separately and in different cars. They acted friendly, a source told E! News.
Baldwin is a big fan of Mayer and the two have exchanged pleasantries on Twitter before.
"I am obsessed with John Mayer," she told ES magazine in 2016. "I love him. I just think he's so talented. I have his documentary in my iTunes. I watch it all the time. I know Continuum start to finish, every word."