12/26/2012 10:12 am ET

Katy Perry: John Mayer Is 'Santa Baby' (PHOTO)

Katy Perry and John Mayer seem to have gotten serious about each other, since going public with their romance earlier this month. Perry, 28, and Mayer, 35, reportedly even spent Christmas at the "Firework" singer's parents' home.

"They're happy together and with her family for the holidays," an insider told People. "John really likes getting to know Katy's family better."

But now the new couple have made perhaps the ultimate display of affection: Mayer donned a Santa suit and let Perry tweet a photo of him.

We think his body is a winter wonderland. (Sorry.)

katy perry john mayer