Can anyone fill Jessica Alba’s bikini in “Into The Blue 2?” Probably not, but Laura Vandervoort (“Smallville’s” Kara) and Audrina Patridge (“The Hills”) will try. The TV beauties will co-star in the follow-up to the 2005 treasure-hunt movie that featured the sun-splashed Alba at her ravishing best. According to “The Hollywood Reporter,” Vandervoort and Chris Carmack play a married couple hired to dive for buried treasure. Audrina, the first Hills’ alum to get an acting role in a feature — that take Heidi — plays “a no-nonsense… beach babe whose boyfriend caters to her every command.”