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"And just as in every lifetime before this one, and as in every lifetime that will follow it, I said yes," Fox wrote in her post.
The couple first met while filming Midnight in the Switchgrass and eventually went public with their romance last summer after Fox appeared in Kelly's "Bloody Valentine" music video. Since then, they have shared plenty of glimpses inside their passionate love affair.
Megan Fox; Inset: Jamie McCarthy/Getty Images
In addition to joining together in marriage, the couple will be joining their respective families when they tie the knot.
Kelly has a 12-year-old daughter named Casie Colson Baker, whom he shares with ex Emma Cannon. Meanwhile, Fox has three sons with ex Brian Austin Green: Noah Shannon, 9, Bodhi Ransom, 7, and Journey River, 5. Fox was also stepmom to Green's son Kassius Lijah Marcil-Green, 19, from his previous relationship with actress Vanessa Marcil.
Learn more about Fox and Kelly's soon-to-be blended family ahead.
Machine Gun Kelly's Daughter, Casie Baker, 12
Jamie McCarthy/Getty Images
Kelly and then-girlfriend Emma Cannon welcomed Baker in July 2009. Though Cannon has stayed mostly out of the spotlight, Kelly has taken Baker to a handful of events over the years (see some of their cutest father/daughter moments here).
In addition to stepping out on the red carpet with Baker, Kelly has been very open about his close bond with his daughter.
"I trust her opinion more than I trust my own now," he told Kelly Clarkson in November. "Like, she has her finger on the pulse of what's hot, or if I'm doing a song and it's the right one, she'll confirm it."
Megan Fox's Son, Noah Shannon Green, 9
Brian Austin Green/Instagram
Noah is Fox and Green's firstborn, who they welcomed in September 2012.
"We are humbled to have the opportunity to call ourselves the parents of this beautiful soul and I am forever grateful to God for allowing me to know this kind of boundless, immaculate love," Fox wrote at the time.
Both Fox and Green have been open about how they are raising Noah to be unapologetically himself.
"Sometimes, he'll dress himself and he likes to wear dresses," Fox explained during an episode of The Talk in 2019. "And I send him to a really liberal, hippy school, but even there — here in California — he still has little boys going, 'Boys don't wear dresses,' or 'Boys don't wear pink.' So we're going through that now, where I'm trying to teach him to be confident no matter what anyone else says."
Megan Fox's Son, Bodhi Ransom Green, 7
In February 2014, Fox and Green welcomed their second son together, Bodhi.
After Fox shared a sweet photo of Bodhi in December 2020, many commenters noted his striking resemblance to the actress as they share the same piercing blue eyes. "Bodhi: Stunner. Clown. Unicorn," Fox captioned the photo.
Megan Fox's Son, Journey River Green, 5
Journey is Fox and Green's youngest son, who they welcomed in August 2016. The news that the couple was expecting their third child first broke in April 2016, almost a year after Megan filed for divorce in August 2015.
In May 2020, Green announced his separation from Fox after nearly 10 years of marriage. "We've had an amazing relationship and I will always love her and I know she'll always love me," he said during an episode of his podcast …With Brian Austin Green.
"As far as a family, what we've built is really cool and it's really special," he added. "So we decided let's make sure that we don't lose that. Let's make sure that we're always friends with each other and we're a united front with the kids. We'll do family vacations and holidays with the family and really make that a focus with the kids."