Gaga’s PA to release a tell-all book

LAS VEGAS - AUGUST 13: (NO ARCHIVES/EDITORIAL USE ONLY) Recording artist Lady Gaga performs during a stop of The Monster Ball Tour at the MGM Grand Garden Arena August 13, 2010 in Las Vegas, Nevada. The singer is touring in support of the album, 'The Fame Monster.' (Photo by Ethan Miller/Getty Images)

Lady Gaga’s ex-assistant has decided to spill the beans on her time with the tea-cup carrying singer.

And she sure doesn’t hold back!

Angela Callahan – who says she quit after a telling off from Gaga for bringing her the wrong pair of tights – alleges that a lonely Gaga would make her sleep with her and that they even showered together to save time in the morning.

She says in her tell-all book Poker Face: The Rise and Rise of Lady Gaga that the queen of pop was a tough boss and even sacked up to 150 people in just 10 months.

Gaga is yet to comment on these revelations…