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And the PDA of the day goes to—drumroll—Gwen Stefani and Blake Shelton!

The No Doubt singer posted the cutest clip of the lovebirds on Twitter Monday night while wishing a Merry Christmas to all of her many followers on social media.

The video shows Shelton kissing Stefani's cheek multiple times as the mother of three breaks out into a smile from ear-to-ear. And between  the adorably matching outfits, the smooch itself and how happy they both look, it's safe to say that these two are going to have a wonderful upcoming holiday together.

In fact, a source told E! News earlier today that The Voice co-stars "spending a lot of time together" and "getting more serious."

"They have been having some great times with each other the past few months and are on the same page of life now," our insider dish.

"Blake is extremely supportive of Gwen and her kids' transition. Blake is really great with kids and loves being around children. He has a lot of patience."

The duo just got back from a weekend trip to Nashville to celebrate the Engagement of singer RaeLynn and Josh Davis, where they "had a blast," another source dishes to us.

It looks like love is in the air!