LeAnn Rimes Kicks Off Birthday Celebrations with Sexy Cleavage-Baring Look
See Some of LeAnn's Sexiest Selfies!

Taking the plunge!

Leann Rimes' birthday may not be until Sunday, but the 33-year-old proved she's still got it when she stepped out in a super-steep, cleavage-flaunting neckline for an evening at celebrity hot spot The Nice Guy on Wednesday night.

The singer opted for an oh-so-sexy look for her night out on the town, flaunting her form in a black blazer buttoned at her waist. Rimes skipped wearing a shirt underneath her jacket in favor of a trio of layered necklaces, which only served to call more attention to her décolletage.

Below the waist, the country cutie flaunted her toned legs in a pair of matching black shorts that she paired with sparkly Stuart Weitzman heels.

Rimes, who was joined by husband Eddie Cibrian, took to Instagram to reveal that the outing was part of what appears to be a weeklong birthday celebration leading up to her big day on August 28.

"Last night was bday fun with a few of my bff's," she captioned a shot of her and Cibrian. "This one especially... I love him! #bday #happybdaytome #hubbylove #lucky #34."

It appears one of said BFFs traveled to Los Angeles to help the blonde beauty celebrate turning 34.

" When your #bff is in town...you @soulcycle @christannah Keeping it kinda healthy on bday week #bday #happybdaytome #birthdayweek #soulcycle," she captioned a shot of her and her gal pal.

Looks like her approach to leading a "kinda healthy" lifestyle is working, because her figure definitely looked flawless in her pre-birthday outfit!