Pregnant Hilaria Baldwin strips down to nothing but VERY SKIMPY lingerie to display her growing belly on Instagram As an avid Instagram lover, Hilaria Baldwin has been documenting her second pregnancy with regular social media updates. The 31-year-old yoga instructor seemed especially keen on showing off her burgeoning baby bump while clad in merely her bra and underwear for a Friday post on the picture sharing site. '6.5 months! This is a loooooowwwwww baby #BaldwinBabyBump,' the wife of Alec Baldwin wrote, along with yet another scantily-clad snap. Scroll down for video +5 Growing: Hilaria Baldwin shared this picture on Instagram on Friday, writing, '6.5 months! This is a loooooowwwwww baby #BaldwinBabyBump' In the picture, the mother-of-one is displaying her growing belly - and svelte figure she has maintained - while taking a bathroom selfie of her profile. She's wearing a pink and black lacy bra and a black thong, as her thick tresses flow down her back. Friday also marked National Sibling Day, so Hilaria didn't forget to give love to her other offsprings. The expecting star shared a picture of her 19-month-old daughter Carmen and 19-year-old stepdaughter Ireland - who is Alec's daughter from his previous marriage to Kim Basinger. 'Happy #NationalSiblingDay to "Cah-meen" and "Eye-yand"...all the things a big sis can teach!! Carmen is so in love with beautiful,' she captioned the picture. +5 Sister love: The proud mom also posted this picture of her daughter Carmen, left, and stepdaughter Ireland, right, writing, 'Happy #NationalSiblingDay to "Cah-meen" and "Eye-yand"...all the things a big sis can teach!! Carmen is so in love with beautiful' +5 Healthy: Hilaria shared details of her healthy pregnancy routine with her followers, including this candid snap last week Unsurprisingly, Hilaria - who is expecting her baby boy in June - has maintained a modified yoga routine during her pregnancy which she announced on January 1st. 'Now, with this little baby growing inside of me, I will document for you how I am going to take care of myself while pregnant and beyond,' she said at the time. 'There will be great tips if you are expecting or if you just want to learn really good exercises and nutrition tips....here we go again!!!' She also favours a mainly vegan diet to keep her weight gain at the recommended level. Last month she told NBC's Today hosts Kathie Lee and Hoda: 'I feel so good, I feel so much better the second time around.' She added that Alec, 57, was thrilled at the prospect of fathering a son for the first time. 'This is going to be his first boy,' she said. 'The day that I told him he carried a football around for an hour afterward.' The 30 Rock star also has a grown up daughter Ireland, 19, from his marriage to Kim Basinger.