Rick Diamond, Getty Images | Bauer-Griffin

Looks like singer/actress LeAnn Rimes has another new asset to flaunt along with her whopper five-carat oval engagement ring from new fiancé Eddie Cibrian. Make that a pair.

Rimes displayed a much larger bust-line during her recent canoodling post-engagement holiday with Cibrian in Cabos San Lucas, Mexico (photographed right, above; the picture on the left is from Oct. 2008.)

Her filled-out chest on her trimmer-than-ever frame, which she showed off in several tiny bikinis, has tabloids asserting she's had breast implants.

These then and now pics sure make it seem that A-B-C way.

US Weekly has an unidentified source claiming Rimes indeed went under the knife using the very same surgeon for her expanded chest as Cibrian's ex-wife, Brandi Glanville. "She got a boob job. She has always, always been insecure about her size. She was a small A-cup."

The star, however, was making sly sort-of denials on Twitter. "I have an amazing spice rack on my top shelf, in my kitchen," she tweeted, adding a smiley face. She also tweeted, "The BS I was referring to comes out tmrw."

Later, she added this coy tweet: "The rumors are true...Eddie got chest implants."

She also revealed that her flattering red vacation bikini was by swimwear designer Despi.

The newly-engaged singer definitely has one thing in common with her beloved. The couple strutted impressive his-and-hers six-packs on their sunny beach get-away.

Rimes, 27, and Cibrian, 38, caused a tabloid scandal when they left their respective spouses during the filming of Lifetime's "Northern Lights."

Click here for celebs who have admitted to going under the knife.

Meanwhile, read how Maria Menounos caused a stir during her recent over-exposed beach volleyball game.

And check out models Stephanie Seymour and Bar Refaeli flaunting their bikini curves on holiday.