You know you're old when all celebrity couples who are younger than you are starting to get engaged left and right: first there was Ariana Grande and Pete Davidson, and soon afterwards Justin Bieber and Hailey Baldwin. The latter have even already started planning their wedding, per Baldwin’s aunt Kim Basinger, who said the couple has already settled on a bridal party, Billboard reported earlier this week. And with the kinds of high-profile friends Bieber and Baldwin have, that will be one star-studded wedding. They'll likely be able to pick literally anyone as their wedding singer, but if TMZ has any say in it, they’ll hire Post Malone. 

A TMZ reporter caught up with Post on the street and asked him about the engagement and if he would be down to sing at the ceremony. He said he’s so happy for the couple that he'd even do it for free. "I would love to perform—fuck yeah, for free. I'll be the flower boy or the ring bearer. He's very happy and I love to see my boy happy," Post said. 

“He’s very handsome—not me, Justin Bieber,” he added, with a laugh, as he took selfies with fans. 

It’s not too surprising Post is so happy for Bieber. The two are longtime friends—Post opened for Bieber during the Canadian pop star's Purpose Tour back in 2016, before he had a Billboard chart-breaking album with Beerbongs & Bentleys and two massive hits with “Better Now” and "Psycho." They’ve been pictured several times messing around with one another and have worked together, debuting the collab “Deja Vu” in 2016. The bromance is so deep the two randomly FaceTime each other just to share compliments, which is objectively adorable. 

Bieber proposed to Baldwin earlier this month while the couple was in the Bahamas. Per TMZ, Bieber popped the question at a restaurant, but not before he had his security make sure everyone had put their phones away.