Jessica Biel is ''one of the guys''.
Lance said: ''[Jessica]'s amazing. One of the best people I know.
''She has always been one of the guys. She's like a best friend. It's like hanging out with a best friend.''
Lance was among the guests at the couple's engagement party at the weekend and he will definitely be attending their wedding, regardless of where it takes place.
He said: ''Justin's like my brother, so there's no question about whether or not I'll make it to his wedding.
''Any time you get to travel, it's fun!''
Justin first shot to fame as a member of The All-New Mickey Mouse Club and Lance joked he is planning to send the 31-year-old hunk a reminder of his childhood as a wedding gift.
He told UsMagazine.com: ''The man has everything, so a nice little toaster will do - maybe the one that puts a little Mickey Mouse emblem on it!''