This one's for all those Donna and Hyde shippers out there.Danny Masterson took to Instagram Thursday to share an adorable shout out to his former That '70s Show costar Laura Prepon, who recently went public with her engagement to Ben Foster."This little baby just got engaged. Over/under on me crying at the wedding…" he captioned a throwback picture of the actors from their days starring as Donna and Hyde on the hit comedy, which ran from 1998 to 2006.

The cast of the show has remained extremely close over the years, and Masterson, 40, wasn't the only one to have an amazing reaction to the news.Last week, just three days after the Girl on the Train star and Foster went public with their engagement at the film's premiere in New York City, Prepon appeared on an episode of Live with Kelly — which Ashton Kutcher just so happened to be co-hosting with Kelly Ripa.

Prepon, 36, came running out to give Kutcher, 38, a huge hug — but he had a bone to pick with her for keeping the news under wraps."I love you, but I am so pissed at you [for not telling me]," said Kutcher. "Pre, Pre — this is unacceptable! This kind of thing is unacceptable!""This is deep. This is really, really deep," Kutcher added. "The amount of crap that you gave Mila [Kunis] and I … and you and Ben Foster?! We've known each other all together just as long!"As for how the happy couple celebrated?"We're really private so we kept it kind of private, as Kutch can attest, because no one really knew about it," Prepon told Ripa. "And then we just kind of came out with it!"