It also emerged on Saturday that Mariah made a paternity claim against her ex-boyfriend and was later arrested after slapping him.
According to website TMZ, Frances Lippe said Mariah had been dating her grandson, John Terranova, in Las Vegas while in high school.
The pair had fought after Mariah claimed he was father to Tristyn and she hit him in the face, resulting in charges of battery.
Court papers show she was arrested on December 21 2010 on suspicion of battery domestic violence, injury/destroying property of another and making threatening telephone calls.
Justin joined Selena at the MTV EMAs in Belfast, Ireland on Sunday.
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