Times are tough for Brit -- romantically, I mean. And girlfriend had just ONE thing on her mind and one thing only last night at her Vancouver concert (and it wasn't weed!)!

Girlfriend started the show at 8:15 pm but walked off stage by 9:05 complaining about the overwhelming smell of marijuana smoke in the venue. An announcer said over the speakers:

"It’s become uncomfortable and unsafe for the performers, including Ms. Spears. The show will resume as soon as the air around the stage is clear. The performance will not proceed until the air clears.”

Dayum! Contain yourselves pre-teen Britney fans! We thought you were more wholesome than that!

But anyway, back to that which Britney yearns for ... check out this clip from last night's concert! ...