• BRITNEY SPEARS photo | Britney Spears

Credit: Jon Kopaloff/FilmMagic

Published: Thursday August 08, 2013 06:00 AM EDT

2013

BRITNEY SPEARS

Seeing double? Now 7½ and 6½, the pop star's cuties Sean Preston and Jayden James Federline could pass for twins, though they're separated by almost exactly a year (their birthdates are two days apart). The built-in playmates enjoy many perks of similar sibling-hood, like joint soccer games and gigs in mom's music videos.