Jessie James Decker Shows Off Bikini Body Post-Kids

 is a country singer who has a flair for design.

The 37-year-old mother-of-four has now helped create a new line of swimwear for Cupshe. 

The Cupshe x Jessie James Decker Casa del Sol collection will roll out in two parts.

The first drop launched on Thursday. The second drop introduces husband Eric Decker in new menswear styles, launching March 5.

'My @cupshe co-design collection is officially LIVE!! Welcome to Casa del Sol, a place where everything faces the sun,' the beauty wrote in her Instagram caption as she shared a video where she modeled the new line.

'Y’all loved our collection last year, so we made this one even more vibrant to brighten up your vacation wardrobe!'

Decker was in top shape for the outdoor shoot by a swimming pool as she wore bikinis and two pieces. 

The songbird has previously talked to DailyMail.com about how she stays in shape and why is her inspiration.

Years ago Decker changed the way she looks at food.  'I shifted my whole thought process on dieting,' she told DailyMail.com.  

'I would count my calories and diet and do more cardio but I realized that wasn’t working for my body anymore. 

'It was effective throughout my pregnancies when I needed to lose baby weight but I needed to adapt to my body and now my body wants to be strong and fuel up.'

She also got specific about her schedule.

'I work out 3-4 times a week with heavy weights, circuit training and light cardio. I also eat as many whole foods as possible.'

As far as the gym, she has taken to lifting weights.

'I am putting in tons of work in the gym and it feels good,' she noted.

Decker works out almost every day and also swims in her pool at home. 

'This is the best I have felt in so long and I know it’s from shifting my mind set too, on top of my new eating and work out habits,' said Decker.

'I used to obsess over the scale counting calories, but now I don’t get on the scale (but maybe once every couple weeks) and focus on before and after pix to watch my progress.'

And being powerful is where it is at for her now. 

'I want to get strong, put on good muscle and feel good and if I want to eat pasta and cookies, I eat it. I put those carbs towards my next work out for energy.

She also named her inspiration.

It's not surprising that Jessie is a fan of the gym-loving Jennifer Lopez, 56, who .

'I love JLO! She is one of my biggest inspirations. She is one of those women that didn’t take no for an answer,' said the siren.

'She wants to do it all, so she does. I think we can do anything we put our mind to and that’s exactly what I plan to keep on doing.'

Decker is now a fashion designer thanks to Kittenish.

Her love for design came early.

'I have always loved designing and fashion. I started designing as early as middle school when I was supposed to be paying attention in math class. 

'I would either write songs or design outfits I could perform in one day on stage! When you look good, you feel good and clothes and fashion are a big part of that for me.

And she is happy to model her own designs.

'I don’t mind modeling if I feel good in what I’m modeling and that’s the beauty of modeling my own line! I feel great in the pieces or I wouldn’t have included them in the Kittenish line.