By DAILY MAIL REPORTER
Kevin Federline's brother is allegedly claiming he fathered Britney Spears' eldest son, Sean Preston.
Christopher Federline has reportedly filed a temporary restraining order against the pop star in which he claimed to be the 'true father' of the 7-year-old.
The Toxic singer also has a son Jayden James, 6, from her three-year marriage to former back up dancer Kevin.
Christopher lodged the complaint on December 18 in U.S. District Court in Tampa, Florida, according the National Enquirer, in which he accused her of blackmail and harassment.
Britney is yet to comment on the bizarre allegations and a spokesperson did not immediately respond to a request for comment when contacted by Mail Online.
In the papers, Christopher allegedly claimed Britney recently 'went to Kevin’s house to pick up Sean Preston and Jayden James, and [his] wallet was on Kevin’s coffee table when Britney opened it up and stole [his] Capital One credit card.'
He claims that when he followed up on the alleged theft - which came to more than $4,500 in charges - 'Britney … laughed at me [and] told me my brother Kevin ruined her life. Britney made fun of me and told me I have a small penis.
'She also blackmailed me and told me if I tell the police that she stole my credit card, that she will tell the world I’m the true father of Sean Preston, not Kevin.
'I do confess I slept with Britney, and I am the true father, but the public does not need to know,' he allegedly admitted.
Little is known about Kevin's relationship with his brother, who is understood to have been married to a woman called Alisha during the time of the alleged Britney 'fling'.
Kevin, who is a father of five and recently welcomed a daughter Jordan with his current girlfriend Victoria Prince, is also yet to comment on the matter.
X Factor judge Britney, who split from Kevin in 2007, is now engaged to marry Jason Trawick.