AceShowbiz - Post Malone is offering Justin Bieber his musical services for free for his upcoming wedding to Hailey Baldwin.

Justin popped the question to his supermodel girlfriend earlier this month as the couple vacationed in the Bahamas, one month after rekindling their 2016 romance.

While a date for the impending nuptials has yet to be announced, Post, full name Austin Richard Post, has joined a host of celebs wanting in on the big day as he confirmed he would love to perform for his close friend at the event.

When asked by editors at TMZ if he would take to the stage at the wedding, the Rockstar rapper quickly replied: "I would love to!"

The 23-year-old was then pressed if he would do the show for free, to which he responded: "F**k yeah for free!" before laughing: "I'll be the flower boy, is that a thing? Or is it the ring bearer?"

Post also offered his congratulations to his close pal and admitted he "hoped" this marked a happy ending for the star, whose previous on/off relationship with Selena Gomez between 2010 and 2017 continually made headlines.

"He's very happy, I love to see my boy happy," Post gushed. "I just want him to be happy, whatever he does."

Post and Justin first became friends in 2016 when the rapper supported the popstar on the North American leg on his Purpose World Tour and have been vocal supporters of one another ever since.

In 2017, Post was caught taking a video call from the Sorry singer before his appearance on YouTube's H3 podcast and the pair went viral for their budding bromance.

"I think you have the best smile in the game. I think you are the best singer in the world. I think you have beautiful abs... I think you have a beautiful soul," Post can be heard telling his pal in the video, before Justin gushes in response: "This is the beginning of not only your success in your artistic world, but you have so much to gain in your private life and your relationships... You are such a kind person. You make me feel good. And I love you."