No topic was off limits when LeAnn Rimes sat down exclusively with ET's Nancy O'Dell.

Video: LeAnn Rimes Gets a Tattoo of Her Wedding Vows

The country superstar, whose controversial relationship with husband Eddie Cibrian has been a hot topic as of late, opens up about her anguish at the situation. In the interview airing Wednesday, LeAnn addresses her cheating concerns related to Eddie and whether she contemplated suicide in her dark moments.

Also tomorrow, Kirstie Alley welcomes ET exclusively into her fabulous kitchen!