She's powered home the message of body-confidence.

And Lena Dunham rocked yet another swimwear look on Monday - just 24 hours after stripping down to a bikini.

The 29-year-old star posted a snap posing in a 1950s style bottle-green flared-skirt swimsuit which cinched at the waist.

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Vintage style: The 29-year-old star posted a snap posing in a 1950s style bottle-green flared-skirt swimsuit which cinched at the waist

She captioned the image: '@jennikonner selected this vintage Norma Kamali swimsuit realness like 3 years ago and promised me it would have its day. Boy oh boy did she see the future #sexico'

The actress saw in the new year in Mexico in just her bikini which she showed with a serious-looking selfie on Sunday.

Reclining on a striped towel photo while sporting a black two-piece swimsuit, she wrote: 'Not her natural habitat but she's trying her darnedest!!!!'

'Not her natural habitat': Lena sported a black two-piece swimsuit in an Instagram post

The Golden Globe winner donned a sports bra-inspired top with high-waist bottoms featuring a gold chain detail.

Keeping stony-faced for the camera, the creator, writer and star of HBO's Girls wore no makeup and pulled her damp brunette locks back.

And the bikini selfie comes just two days after she showed off her derriere while wearing just a jacket and cream colored underwear on Instagram.

New Year's fun: Her bikini selfie comes just two days after she showed off her derriere while wearing just a jacket and cream colored underwear on Instagram

The TV star, who is face down on the ground in the New Year's snap, joked in the caption: 'Super sad local news story: girl dies of shock after confetti cannon erupts several feet away. Underwear out. No one mourns.'

Earlier in the evening, the brunette wore a black dress featuring gold hand prints all over, even stopping to take a sweet photo with her boyfriend of four years, Jack Antonoff.

In the picture, Jack, who plays the guitar in the band, Fun, embraces his girlfriend while lovingly resting his cheek on her head.

Lovebirds: Earlier in the evening, the brunette wore a black dress featuring gold hand prints all over, even stopping to take a sweet photo with her boyfriend of four years, Jack Antonoff

She captioned the photo: 'So much joy to you and yours! Thank you for making 2015 a pleasure, insta-friends! Lucky to spend my fourth NYE with his old man.

Her Girls co-star, Jemima Kirke also made an appearance on her Instagram, in a playful photo mimicking the hand pattern on Lena's dress.

Jemima posed with her hands over Lena's chest, while her husband, Michael Mosberg, snapped the picture.

The HBO star wrote: 'Captured by @mikemosberg on his LUMIX-he's a real arty guy that guy. Hey 2016, you have nice eyes.'

She's a handful: Her Girls co-star, Jemima Kirke also made an appearance on her Instagram, in a playful photo mimicking the hand pattern on Lena's dress