247PapsTV / Splash News
Well, don't these two just get more adorable every day?!
"happy birthday cutie!!! @JohnMayer," the "Roar" singer wrote.
The sweet tweet comes on the heels of a source telling E! News that the duo is "very serious" with those close to the couple saying they wouldn't be surprised if the lovebirds got engaged in the not-so-distant future.