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.
In addition to sending B-day wishes to her man, the 28-year-old pop star had some exciting new of her own to share—she's the latest CoverGirl spokesmodel!
"Today is my 1st day as a @CoverGirl!" she posted on her Twitter page, sharing her gorgeous first ad for the brand.
Perry is currently gearing up for the release of her forthcoming album, Prism, which will debut on Oct. 22, while Mayer is in Europe touring after the Aug. 20 release of his sixth studio album, Paradise Valley.
The "Gravity" crooner's record also features a duet from the lovebirds, titled "Who You Love," and the dark-haired beauty couldn't help but gush over her man to E! News when asked about the sweet tune the twosome made together.
"I've been a fan of John's for years before I got to actually kiss him," she also told E! News at the 2013 MTV Video Music Awards. "But I've been such a fan, I think he's so incredibly talented and gifted and a genius songwriter. So to be a part of anything he was doing was just natural."
The pair is apparently closer than ever, and, according to the New York Post's Page Six, they hit the dance floor at Mayer's brother Carl's wedding on Sunday at the Mamaroneck Beach and Yacht Club in Westchester County.
Last night, Mayer performed in front of a packed house in Herning, Denmark, and tonight, he is expected to spend his birthday in Frederiksberg, where he'll perform at the Forum Copenhagen.
Coincidentally, Perry's single "Birthday" was leaked on her BF's special day.