PHOTOS: Britney's Bikini Blow-Up

For the third day in a row, Britney Spears slipped into a bikini and got her swim on at the Ritz-Carlton hotel pool in Marina Del Rey, Calif. On Monday, the pop superstar was once again joined by sons Sean Preston and Jayden James, who both received help from mom when it came time to inflate their water wings.

SEE ALL 16 PICS OF BRITNEY IN THE GALLERY!