AceShowbiz -

Blake Shelton is reportedly hiding shameful family secrets from his girlfriend Gwen Stefani. Rumor has it, the "Sangria" hitmaker fears the "Hollaback Girl" hitmaker will leave him if she knows about the dark pasts of his family members.

Blake's family tree is full of rotten apples and their dark secrets could tear his relationship with Gwen apart, sources close to the couple tell Radar Online. According to the source, his relatives have a sleazy past of DUI busts, infidelity, and even worse.

Blake's father claimed in his divorce papers that the singer's mom began "dating and spending all night on numerous occasions ... living with at his place... a third party who is married!"

Blake's former stepbrother Terrell Delozier, whose mom was married to the singer's dad until his death in 2012, was allegedly busted for booze in 2003 when he wasn't even 21. Terrell reportedly got off with a six-month deferred sentence, but he went on to be arrested twice in 2010, on weapons and drug charges, as well as public intoxication.

In 2016, Terrell was charged with attempting to elude police after he reportedly fled on foot when a witness described him as "messed up on something" while driving.