Zsa Zsa Gabor -- Back to the ER ... But I Ain't Dead!

Zsa Zsa Gabor is ALIVE and kickin' (OK, not exactly kickin' 'cause she only has 1-and-a-half legs) but she's ALIVE ... despite another major medical scare this week.

TMZ spoke with Zsa Zsa's hubby ... the von and only Prince von Anhalt ... who tells us ZZG was rushed to UCLA medical center Wednesday morning after developing a nasty infection around her feeding tube.

We're told the 95-year-old Hollywood icon underwent surgery to treat the infection. She's still in the hospital so doctors can closely monitor her recovery.

When asked how he was handling the situation, Prince couldn't have been more clear -- "This really f**ked up our Christmas."