Katy Perry and John Mayer are back on again.

According to People magazine, a source told the magazine that the on-again, off-again couple are “definitely back together.”

Katy Perry, 30, and her 37-year-old rocker attended the wedding of Girls star Allison Williams’ in Saratoga, Wyoming, on Saturday. The couple reportedly did not hide the fact that they were reunited and let the PDA flow.

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

Are @KatyPerry and @JohnMayer back together? http://t.co/htkPS9NgJz pic.twitter.com/I09myO8Mip

— HELLO! (@hellomag) September 21, 2015

The musicians, who split in February of 2014, fueled rumors of reconciliation when they stepped out for a double date with Williams and her then-fiancé Ricky Van Veen at the Chateau Marmont in January.

As previously reported by WebProNews, Katy and John broke up twice this year —in March 2015 after a January reconciliation. In July, the two reunited and were even spotted together at A Grateful Dead concert but called it quits later that month. Following their brief breakup, Mayer and Perry were together once again in August, reports said.

“They’re spending a lot of time at his house talking over their feelings and trying to see if they can make it work,” a source said at the time.

Katy Perry and John Mayer "back together" after holding hands at Allison William' wedding! http://t.co/s44oXrjCYD pic.twitter.com/YsjxbKexTZ

— heat & heatworld.com (@heatworld) September 21, 2015

Attended by close friends and family, Allison Williams wed Rickey Van Veen, which was officiated by Tom Hanks and where Mayer serenaded the newlyweds.

Other guests were Williams’ father, Brian Williams, Lena Dunham, Zosia Mamet, Jemima Kirke, Bruce Springsteen, Andy Cohen and Bee Shaffer.

Word is Katy Perry and John Mayer flew in in separate planes but were inseparable during the nuptials. Do you think Perry and Mayer can make it work?