“Quit talking to my peeps,” that’s the Britney Spears is throwing to estranged hubby Kevin Federline

New York Post sources are snitching that Brit, who is working on her upcoming album in Las Vegas (with Sean P and Jayden J in tow), is livid that her ex is still chatting with mutual friends of the former couple-including the roomie of Brit’s bro Brian:

“He is still really good friends with Brian’s roommate. Brian isn’t the biggest fan of Kevin,” the Post’s link snitches.

Fed-Ex spent Monday night partying with Brian and his buds at L.A’s Butter Nightclub. Kev’s rep Marilyn Lopez confirms that the “rapper” does socialize with Brian’s friends.

Britney and Kevin, who are both seeking full custody of the sons they share, have agreed to a joint custody agreement for the month of February.