Former child star Amanda Bynes is a terrible drunk - she can't swallow a drop of alcohol without vomiting.

The 22-year-old actress may be old enough to legally drink in her native U.s. but admits she gets sick too quickly - so prefers to stay sober.

Bynes says, "I'm not a big drinker. I puke every single time I get drunk."

"On my birthday, I'll go out, but I'll probably not go out again until my next birthday, which is kind of depressing. I'm tired at night, and I don't have that energy."