Only hours after walking the red carpet at the L.A. premiere of Lions for Lambs, Tom Cruise and Katie Holmes hopped an east-bound private plane headed for Manhattan, where sources confirm to OK! that Katie is planning on taking part in Sunday’s New York City Marathon.

As OK! exclusively reported several weeks ago, after months of secretly training in predawn runs in Beverly Hills and Berlin, Suri‘s mom is scheduled to make her first-ever marathon run this weekend. The 28-year-old actress, who celebrates her first wedding anniversary to Tom on Nov. 18, will join thousands of other masochists runners, including cyclist Lance Armstrong, in the race that begins at the foot of the Verrazano Narrows Bridge in Staten Island and works its way through Brooklyn, Queens, Manhattan, the Bronx and then back to Manhattan, where everyone collapses in exhaustion in Central Park.

Assuming Katie makes it all the way, she’ll have quite a welcoming committee at the finish line, as several members of the Holmes family are flying in from Ohio to cheer her on. They’ll join her superstar hubby at the Finish Live Banquet at Tavern on the Green where they can watch the race on monitors, get updates on racers — “Go Katie!” — and be just feet away from the racers as they clock in.

Oh, and just in case you believe the newest batch of pregnancy rumors surrounding TomKat, OK! spoke to Katie’s rep who says in no uncertain terms that the actress is “not pregnant.”

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