As expected, BRITNEY SPEARS announced an upcoming two-year residency at Planet Hollywood in Las Vegas on "Good Morning America" yesterday. 

As part of the insanity, Britney arrived in Vegas in a helicopter, where she was "surprised" by more than 1,000 of her fans, who had gathered in the desert in the middle of the night. 

But it sounds like the helicopter did a number on her stomach.

She said, quote, "It's craziness.  It's so chaotic.  Actually, I got SICK in the helicopter.  I was like 'Oh, my God!'  But this is amazing, it's so cool."  

Technically, Britney didn't SAY that she blew chunks, but that's the most amusing interpretation of her "getting sick," so we'll go ahead and assume that's what happened.

(Good Morning America