Hollywood chateau marmont avril lavigne west hollywood singer

Avril Lavigne stepped out with her girlfriends for a night of partying at Chateau Marmont, and Brody Jenner's girlfriend rocked a loose-fitting tank, tight bands and funky boots.

Just yesterday, the 27-year-old pop-punk princess headed to a Beverly Hills nail salon wearing a baggy sweatshirt ... and she had a diaper safety pin attached to her Birkin bag!

Although her rep denies that Avril is expecting, it still makes us wonder why she wouldn't wear a tight tank to dispel any kind of rumors.

Like Avril sings in one of her hit songs, "Why'd you have to go and make things so complicated?"