Backstreet Boy Nick Carter celebrated his 32nd birthday this weekend by getting a much younger hairdo -- Bieber bangs!

The singer showed off his surprising new look at Vanity Nightclub at the Hard Rock Hotel & Casino in Las Vegas on Saturday night.

We're not really loving the look, which makes him just look like an older guy trying to look like the young, cool kids.

Backstreet Boys, *NSYNC, 98 Degrees and more -- check out how some of the other former teen idols have aged through the years in the gallery above.