By Neal Broverman

Originally published on Advocate.com October 01 2012 7:34 PM ET

A new biography claims Barbra Streisand walked in on her first love in bed with another man.

In Hello Gorgeous: Becoming Barbra Streisand, author William Mann says Streisand was shattered after discovering bisexual boyfriend Barré Dennen having sex with a man. Streisand was only a teenager when the incident occurred and Dennen was Streisand's first love, according to Mann. Read more here.

Back to the present: A new trailer has appeared for The Guilt Trip, Streisand's new comedy with Seth Rogen that opens on Christmas. The actors portray mother and son embarking on a cross-country drive. Watch the trailer below.