There's absolutely no hard feelings between Ashlee Simpson's ex, singer Ryan Cabrera, and her husband, Evan Ross!
The "On the Way Down" singer is hosting another one of his "Live from Ryan's Living Room" concerts -- a live charity music series -- this Sunday, which will feature Evan. Ashlee married Evan last August and the two are currently expecting their first child together, while viewers of MTV's The Ashlee Simpson Show will remember that she dated Ryan back in 2004.
However, Ryan and Evan are clearly close pals.
"We actually have a song together on my album that's coming out in the fall," Cabrera tells Us Weekly about their surprising friendship. "So we did finally get to collaborate together and we have a song called 'One and Only' that we wrote together."
He has nothing but praise for the 26-year-old son of the legendary Diana Ross.
"I've been waiting for Evan to finally put out his music," Ryan says. "I'm like a proud papa watching him come out and be so talented!"
Ryan's latest "Live from Ryan's Living Room" concert starts at 3 p.m. PT this Sunday. Aside from Evan, the show will also feature former Glee star Chord Overstreet as well as numerous DJs and a comedian.
ET caught up with Ryan in February, when he dished that he actually attended Ashlee and Evan's wedding in August.
"Of course, she married one of my best friends," he shared. "I'm friends with all my ex-girlfriends."