When it comes to promoting her own swimsuit line, Carrie Underwood doesn't waste money hiring models.

Instead the American Idol alumni showcased off her own designs by posting a well-timed bikini photo on her Instagram page.

'Love this swimsuit!' tweeted the slimline star, who tagged her post '#vacation #ocean #staythepath'.

'Love this swimsuit!' Carrie Underwood shows off her incredible post-baby bikini body on a boat trip with Mike Fisher this week in Mexico

All her own design: Her toned and trim figure was displayed in a Calia By Carrie design of black bikini top and floral bottoms

In the image the singer stood proudly alongside an American flag on a boat, while enjoying a vacation with her husband Mike Fisher.

Her toned and trim figure was displayed in a Calia By Carrie design of black bikini top and floral bottoms.

Carrie's trim figure is a result of plenty of hard work. The mother-of-one has stuck to a strict vegetarian diet and worked out regularly following the birth of her son Isaiah 16 months ago.

Sun safe! The couple were seen rubbing sunshine on one another, as they relaxed on their yacht with a group of Carrie's bikini clad pals