Maroon 5 guitarist James Valentine, celebrity chef Gordon Ramsay and Lord Of The Rings star Sean Astin will be among the 25,000 runners hitting the streets of Los Angeles on Sunday (18Mar12) for the city's 27th annual Honda L.A. Marathon. This year's big event begins at Dodger Stadium and ends blocks from the Santa Monica Pier. The run will be Astin's third - he also competed in 1998 and 2010.