Lady Gaga — BACK in Bikini Shape

Less than a year after gaining 30 pounds, Lady Gaga is back down to her fighting weight — surfacing south of the border in Mexico this week with some friends … in a sexy floral bikini.

You”ll recall, Gaga struggled with her weight last year, telling Stylist Magazine, “I don”t really care if [people] think I”m fat, because, quite honestly, I did gain about 30 pounds.”

Gaga also underwent serious hip surgery a few months ago … so that probably helped with the weight loss too.

Too bad she had to give up that golden wheelchair.