Two of Britney Spears' ex-husbands are seemingly at odds, as Sam Asghari appeared to throw shade at Kevin Federline over the latter's upcoming memoir. The Traitors star, 31, was asked by TMZ on Saturday, August 16, if he had any thoughts on Federline, 47, writing about his marriage to Spears, 43, in his new book, You Thought You Knew. "[Kevin] was a professional father, so it would be the first book that would tell you about how to be a professional father," Asghari replied with a grin.