Katy Perry and John Mayer Held Hands at Allison Williams' Wedding

— -- Stop us if you've heard this one before: Katy Perry and John Mayer could be back together again.

The couple was photographed holding hands over the weekend at the wedding of "Girls" actress Allison Williams and College Humor founder Ricky Van Veen in Wyoming.

"John and Katy looked happy," a source told People. "They held hands and sat next to each other during the wedding ceremony."

Perry, 30, and Mayer, 37, first began seeing each other in 2012 after her divorce from Russell Brand. They last split in February 2014 after several months of being a couple.

"I’m living in the now and not fantasizing about the past," Perry said at the time. "I have a lot of respect for [John] still, and I know it goes both ways. There’s no bad blood, but I’m sure there will be inspired songs."

However, early this year they were spotted together on a double date with Williams and Van Veen, and in July, the two musicians were also seen together at the Grateful Dead farewell concerts in Chicago.

Reps for both stars have not responded to requests for comment.