While Ryan's ex-wife, Scarlett Johansson, and ex-fiancé, Alanis Morissette, have yet to comment on the union, Blake's ex-boyfriend of three years, Penn Badgley, had nothing but warm things to say.
"I actually didn't know until last night, but I think it's fantastic," Penn told People, while on set in Toronto filming Greetings from Tim Buckley. "I couldn't be happier for her."
Penn has since moved on and is romancing Zoe Kravitz, who he's dated for about as long as Ryan and Blake.
Blake and Penn co-star on the CW series Gossip Girl and led a private romance before splitting in October of 2010. The duo were spotted vacationing and holding hands, but never talked to the press about their relationship.
Their break-up was just as quiet, and even co-stars were in the dark, commenting that the actors are "just very private."
"I don't comment on my relationships," Blake told the October 2010 issue of Allure. "My anonymity is something I treasure. Wanting to be an actor and wanting to be famous are different."