When Sean Preston and Jayden James Federline were looking for a male role model to play with in the pool on a recent trip with mom to Mexico, they needn't look far.

Britney Spears' boyfriend Jason Trawick was ready to jump right in.

"Jason is great with the kids and you can tell Britney really trusts him," an eyewitness at the Tides Zihuatanejo resort in Mexico told Us Weekly of Britney's beau.

Falling in love with him helped save Britney, but also benefits the kiddies: "He would pick up Jayden if he wanted to be held, immediately calming him down."