Yes, we know Justin Bieber's 18th birthday was yesterday. But a milestone that monumental deserves an extra day of celebration.

So to help us with that we have a clip from 'Conan' last night.

O'Brien and his staff made a compilation of all of Bieber's biggest fans wishing him a happy birthday on YouTube, which Conan described as "sweet." But,  of course, there was a twist.

Pretty creepy stuff. So you probably never thought you'd see a grown man with a thick mustache doing the signature Bieber heart hand, right? That there is the downside to being a pop sensation.

However, the upside is that people give you $100,000 sports cars for your birthday. So, all in all, Bieber is still coming out way ahead.