LeAnn Rimes didn't want to talk to X17 about reports she has a sex tape with ex-husband Dean Sheremet, but she did Tweet about it.

The singer-actress posted on the social networking site the other day: "I hear there are rumors (sic) of a 'sex tape.' I have never filmed myself having sex on tape, period. Haven't joined that club lol."

Which kinda seems to suggest she's joined other clubs ... hmmm ....

The newly-married star got her locks chopped at Chris McMillan Saturday and, of course, she took to Twitter to thank the hair stylist-to-the-celebs: "Total new haircut! Love it! Thx my dear Chris McMillan for taking four inches off! I'm a new woman!!!"

Oh lordy -- a new woman again?!