John Slattery has nothing but praise for his longtime co-star and friend Jon Hamms recent engagement .

Slattery starred alongside Hamm on AMCs Mad Men from 2007 to 2015. He also directed the new comedy Maggie Moore(s) , starring Hamm and Tina Fey, which opens in theaters Friday.

Speaking to People at New Yorks Tribeca Film Festival this week, Slattery said he couldnt be happier for Hamm, who announced his engagement to longtime girlfriend Anna Osceola in February.

I mean, theyre lovely. Together, theyre great people, he said. Im extremely happy for them.

Noting that he couldnt be luckier in his own 25-year marriage to actor Talia Balsam , Slattery added: I hope he has the same luck as I did.

Interestingly, Osceola appeared in the series finale of Mad Men, where she played a spiritual retreat receptionist who flirted with Hamms character, Don Draper. However, according to Entertainment Weekly , she and Hamm did not begin dating until 2020.