Friend Suggests Beyonce 'CHEATED' On Jay Z With Lebron James . . . Was 'SIDE PIECE'!!!

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Jay Z wasn't the only one with a SIDE PIECE during his relationship - according to new allegations. LeBron's former friend suggests that Beyonce was allegedly LeBron's side piece.

This SHOCKING new claim is being levied - by Lebron James former friend - a Miami rapper named Lambo. Lambo was a friend to the entire James family while he dated Bron's mother Gloria. And Lambo was on the INSIDE . . . so he knew all of LeBron's secrets.

Lambo took to social media yesterday and suggested that Bey was Bron's "mistress". He's writing a TELL ALL BOOK exposing the alleged secrets about LeBron James.

This is what he said:

THANKS FOR WATCHING!

MY BOOK WILL BE GIVING THE WORLD THE TRUTH ABOUT WHY @beyonce WASN’T INVITED TO @kingjames WEDDING, AND ALSO WHY #savannajames Wasn’t invited to @beyoncewedding, THE MISTRESS WILL BE EXPOSED IN MY BOOK, MAYBE ITS A CUZING OF #jayz or @beyonce, U HAVE TO READ MY BOOK TO KNOW .

This is a starling claim by Lambo - and one which is COMPLETELY UNSUBSTANTIATED. But we can't help but remember when Jay and Bey were at the NBA Finals and Jay seemed a bit uncomfortable with the way LeBron was watching Bey.

As you know, it’s been quite a journey for LeBron James and his wife, Savannah James. She is the former Savannah Brinson, and they married in 2013. LeBron and Savannah were high school sweethearts.

Savannah was a cheerleader and high school softball player who met LeBron at a football game in Ohio. According to Sportster, at first, Savannah wasn’t aware that LeBron was a high school basketball phenom. When LeBron asked a friend to get her phone number, Savannah said no, although she took his.