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."
Britney Spears is all smiles with her new man - and so are the kids.
Sources close to the pair say Jason Trawick has a calming influence over the boys that has Britney, who divorced their dad Kevin Federline in 2006, at peace.
"He is absolutely fantastic with the boys," a Trawick pal said.
"When you see him with them, you wouldn't think for a moment that he wasn't [Sean Preston and Jayden James'] dad. He treats the kids like they are his own."
"[Jason] is very mature and seems ready to take on the responsibility of a single mom with two kids," another friend of Britney's agent-turned-lover extolls.
Trawick, 37, described as "a nice guy who doesn't take life too seriously," stood by Spears in her darkest moments and has been instrumental in her recovery.
Spears has visitation rights and sees her sons about half the time, although that dirtbag K-Fed maintains custody of them, at least from a legal standpoint.