Kings Of Leon's Caleb Followill, who is engaged to Victoria's Secret model Lily Aldridge, knows he is getting married this month but has no idea of the actual date. 

He puts being kept in the dark down to the fact that he has "a big mouth" because his fiancée doesn't want him to blab it to the press:

"You have to ask Lily about the wedding date. She won't tell me. I think it's somewhere between May 10 and May 20, but she won't tell me because I have a big mouth!"

His brother, Jared Followill, can't wait for the wedding and revealed to People magazine there's a particular reason he's looking forward to the big day:

"I'm so excited for the wedding. I just hope she invites all of her model friends to the wedding. That's the only reason I'm going."

"It's going to be a very small wedding and then a big party. I think there are only like maybe 25 people or so going to the wedding, but a lot of people will be at the party."

Watch the trailer for the new Kings Of Leon documentary film here: