Sofia Richie made it official with Scott Disick via Instagram. The move follows a big reveal on Keeping up with the Kardashians.

Making It Instagram Official

The latest episode of the hit reality show saw 34-year-old Disick admitting, under serious pressure, to momager Kris Jenner that he's seeing 19-year-old Richie. The two were rumored to have been seeing each other for months.

Now, Richie has gone public about their relationship on the biggest social media stage of all. The model shared a sweet black-and-white shot of her and Disick on Instagram, both wearing sunglasses, arms wrapped around each other.

"Happy Valentines babe," read the caption.

 Happy Valentines babe A post shared by  Sofia Richie (@sofiarichie) on Feb 14, 2018 at 3:20pm PST

Disick did not respond to his beau's Valentine's Day greeting, but he may be considering his admission on KUWTK as a grand romantic gesture that a public declaration wasn't necessary.

A Kardashian Komeback

Disick's ex, and the mother of his three kids, Kourtney Kardashian, is reportedly none too pleased about his new relationship. This is due, in large part, to the significant age gap between the two, something Kardashian's sister, Kendall Jenner, poked fun at on Instagram recently.

"Awww Scott and his kids," commented Jenner under a photo of Disick in the car with his children and Richie.

New mother Kim Kardashian West, who gave birth to daughter Chicago West by surrogate last month, has been the only one to defend the new relationship.

Things are clearly progressing between Disick and Richie, as the 19-year-old model has been spending time with his kids Reign Aston, 3, Mason Dash, 8, and Penelope Scotland, 5, lately. Allegedly, they haven't taken to Richie just yet.

"You could tell that the kids don't know Sofia well because they weren't holding her hand. Instead, they all stayed close to Scott. The kids seemed fine with her, but all sat close to Scott. He helped them at dinner and with potty breaks," a source told PEOPLE.

"Sofia acted like Scott's friend and you could tell she was trying a gentle approach to get his kids' approval," the source added.

Moving On?

Another recent episode of KUWTK saw Kourtney Kardashian detail to mother Kris how Disick still calls her in the middle of the night, complaining about his lot in life, and that he has a real issue with her having a new boyfriend.

Disick and Richie were first spotted together at Cannes in 2017 but made their first official appearance as a couple the following December, in Miami.

Since that trip, they've vacationed in Venice, Mexico, and Aspen. The couple was most recently spotted enjoying dinner together in Nobu on Feb. 8.

Disick and Kardashian ended their 10-year relationship in 2015. She coupled up with 24-year-old Younes Bendjima in 2016.