Britney Spears kept her engagement ring firmly in place yesterday when she treated sons Sean Preston and Jayden James to a game of bowling. Britney and the boys joined her mom, Lynne, and fiancé Jason Trawick for a fun family outing. Lynne gave the boys, Jason, and Britney a kiss and a hug and left in a separate car. Jayden and Sean have been hanging at Britney's new Thousand Oaks mansion for the past few weeks while Kevin Federline continues shooting his latest reality series in Sydney. Kevin was rushed to the hospital with chest pains, but has since made a full recovery and has continued with filming. Kevin's new show Excess Baggage, which begins airing tonight in Australia, chronicles his struggle to maintain a healthy weight. Meanwhile, Britney seems to be keeping herself in top physical condition as she preps for her upcoming wedding.