Adrienne Maloof Paid $25k to Make Out with Mario Lopez

Adrienne Maloof has no problem landing men -- but last night in Los Angeles, she paid $25,000 for a makeout session with Mario Lopez ... and it was all for a good cause.

Maloof and Lopez were part of the Have a Heart Auction in Honor of Zeke ( ... an event to raise money for Zeke Kendall, a 20-year-old man who underwent heart transplant surgery last month.

The auction -- held at Mixology at The Grove -- featured a red dress from the Kim Kardashian collection (worn by Kim herself) and a signed Charlie Sheen jersey from the movie "Major League" (see below).

But "Real Housewives of Beverly Hills" star (for now) Adrienne Maloof saved her money for the chance to lay one on the hunky Lopez ... forking over 25 large in the process.

Maloof either has a huge heart or she's a huge fan of "Saved by the Bell" ... or both.

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