Brad Pitt Relapse Fears — As Struggling Star Gets Together With Sean Penn

Brad Pitt is 
partying with Hollywood hothead Sean Penn — leading 
pals to fear that the newly-sober father of six could give in to boozy temptation!

The longtime pals (seen here in 2008) co-starred in 2011's "Tree of Life," and were spotted at Sean's celeb-studded book release party where alcohol flowed freely. “Everyone knows Sean has a reputation for being a party animal, so it’s crazy to see 
Brad hanging out with him,” an insider told The National ENQUIRER. “Half the battle is surrounding yourself with clean and sober people — and not opening yourself up to falling off the wagon!”

Brad swore off booze during his brutal ongoing divorce from Angelina Jolie, but friends worry Sean’s hard-drinking history could drag him down! “Brad’s looking healthier and happier than ever,” dished the source.“It would be such a shame to see him slip up.”

Insiders insisted that Sean has been able to keep his boozing under control. Brad, however, has been sober for only a year, and remains plagued by personal demons. “Brad is pretty lonely right now, and he’s struggled with depression in the past,” said the source. “If he keeps partying with bad boys like Sean, there’s a fear he could relapse — and that’s the last thing anyone wants!”