Hilaria Baldwin is back in her skimpy lacy lingerie - 12 day after giving birth.

The 34-year-old yoga guru - who gave birth to her fourth child Romeo last month - took to her Instagram account last night (31.05.18) to share a photograph of her post-baby body and share the struggles she had motivating herself to get to the gym.

Alongside the shot, she wrote: ''9 months to 12 days postpartum (I took the photo on the right two days ago). Every body is different, but I believe in staying as active as possible. There were so many moments when I didn't want to work out this pregnancy. Showing up is the most difficult challenge.

''I had to drag myself out and do even a little. Consistency helped me so much though...because the body wants attention and wants to be moved. So important for your circulation, your health, your happiness, and for your strength.

''I just started being able to workout yesterday. Slow and steady. Nothing crazy. Each birth is different and your doctor will be able to advise you on when you can begin.

''When you can, be patient with your body. You have been through so much and created something so precious. Know that day by day, movement by movement, you will regain your strength and feel amazing. #wegotthis2018 (sic).''

Hilaria - who also has kids Carmen, four, Rafael, two, and Leonardo, 20 months, with her husband Alec Baldwin - has had a tough few weeks since the birth of Romeo as she contracted pneumonia - a bacterial infection that attacks the lung - and was forced to shower ''a million times a day'' to make sure she didn't give it to the tiny tot.