Miley Cyrus' Abs: Singer Flashes Toned Tummy In Costa Rica (PHOTO)

01/29/2013 02:34 pm ET

Miley Cyrus showed off her toned abs, courtesy of the pilates class she frequents.

The 20-year-old singer's slim frame was in focus as she posed for a photo wearing denim cut offs and a tube top by Rad and Refined, who shared the photo on their Facebook page.

Cyrus was in Costa Rica with fiance Liam Hemsworth and his brothers, but just because she was on vacation didn't mean she let herself slack. The former "Hannah Montana" star kept up with her workouts, opting to do yoga on the beach.

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