Hollywood Actress Katie Holmes will join cyclist Lance Armstrong and thousands of other runners in New York City's marathon next month, according to reports.

The "Batman Begins" star, 28, has been spotted jogging in Berlin, Germany -- where husband Tom Cruise is filming on the set of the World War II biopic "Rubicon" -- in preparation for the 26-mile race.

A friend tells Britain's Star magazine, "Katie is determined to complete the race and make Tom proud. She's been training for months, both in Los Angeles and in Berlin. She's as fit and toned as she's ever been in her life. Katie is going to surprise a lot of people."