LeAnn Rimes is standing by her man.
She posted a photo of herself kissing Eddie Cibrian on Twitter -- the same day a tabloid report hit stands claiming he cheated on Rimes with his ex wife, whom he left for Rimes.
PHOTOS: Shocking star splits
"Kisses!" she captioned the shot. Rimes, 27, also posted multiple photos and references to the romantic camping getaway they're on.
Meanwhile, Cibrian, 37, accused his ex wife, Brandi Glanville, of starting the rumor that they're back on.
PHOTOS: Women who've been cheated on
"Once again my ex has stooped to a new low attempting to sabotage my beautiful relationship with LeAnn," the former CSI: Miami actor Twittered. "Not surprisingly the ONLY magazine that decided to run the story shares the same credibility and delusion as my ex. They should be ashamed of themselves."
Us Weekly first reported Rimes and Cibrian hooked up on the set of their Lifetime movie, Northern Lights.
PHOTOS: Stars who hooked up on set
Rimes' divorce from Dean Sheremet was finalized in June; Cibrian filed for divorce from Glanville, with whom he has two young sons, in August 2009.