Timberlake Doesn't Like 'em Over 21

4/13/2009 10:15 AM PDT BY TMZ STAFF
Now we know why Justin Timberlake flew Southwest to Vegas -- so he could have more money to throw down on the blackjack tables once he got there!

JT was spotted at the Hard Rock's Peacock Lounge this weekend, at the casino's VIP tables. He may not fly first class -- but he sure gambles that way.