Stepping out following her birthday weekend, Holly Montag attended the ESPN Magazine 'The Body' issue event in West Hollywood on Monday night (October 19).

The MTV vixen hit up the arrivals area at The London Hotel, posing for pictures alongside gal pal Stacey Hall before getting her party on.

The outing comes just after Holly’s gal pal/co-star Stephanie Pratt was arrested on suspicion of drunk driving in Hollywood following a weekend birthday bash for Miss Montag.

And now, Miss Pratt will appear on “The Hills” - speaking with Heidi Montag about her sister Holly’s “out of control” drinking.

Heidi defends her sister in Tuesday night’s episode of “The Hills,” claiming, “She just had too much to drink.”

Stephanie said, “That was not ‘I’m having fun, I’m letting loose, I’m at this great event.’ That was like some other problems going on in her life where she needed to get so drunk that she would black out.”

Heidi claims that she has not seen her sister Holly drinking too much, but Stephanie adds, “Every time we go out, someone asks her to leave … she really needs help, Heidi.”

Celebrity Gossip

Enjoy the pictures of Holly Montag at the ESPN Magazine 'The Body' issue event (October 19)