Machine Gun Kelly Celebrated His Birthday With a Public Kiss from Megan Fox

Machine Gun Kelly rang in his 31st birthday with his girlfriend Megan Fox and their friends. On Wednesday, MGK, born Colson Baker, celebrated with some birthday festivities at popular Los Angeles restaurant Delilah. The musician shared some pictures from the night to his Instagram.

"i'll grow up next summer...SINcerely, birthday boy," he captioned his post alongside a series of photos from his celebration. Their go-to double date partners and the internet's other favorite couple, Kourtney Kardashian and Travis Barker were also in attendance and made an appearance in one of the photos.

Machine Gun Kelly/Instagram

Kardashian and Barker posed behind Kelly and Fox seated at a table, where both Travis and Kelly discreetly flipped the bird. Fox showed some chic underboob, and both she and Kardashian wore all black. Kelly wore a sparkly sweatshirt with silver accents and a pearl neckline and accessorized with a pearl choker.

RELATED: Megan Fox Wore a Chic Underboob Top on a Date with Machine Gun Kelly

Fox shared a sweet birthday tribute for her boyfriend on Thursday.

"Happy Birthday blonde angel baby 🙇🏼🎂 " she captioned the post. On Wednesday night, the two celebrated the big 3-1 with a kiss that Kelly shared in a video to his Instagram Stories. "Dream big," he wrote over the video.

A source told People, the duo "got serious quickly and have a great relationship." Kelly has even been spending more time with Fox's kids, whom she shares with ex Brian Austin Green.

"Colson is getting to know her kids," said the source. "Megan loves her boys, and they will always be her priority. She is excited that they have accepted Colson."