Happy 20th, Sofia!

Seriously, she looks great ... the birthday girl wore a short, black satin mini-skirt and matching crop top and YSL heels to dinner at Nobu Malibu with boyfriend Scott Disick and we can only imagine Scott was celebrating ... celebrating Sofia's birthday that is! Now he can say he's not dating a teenager, which is nice. And his girlfriend's age increased, along with her bust! Is that some kinda magic aging-up thing or is that plastic surgery?