Jamie Lynn Spears All Legs With Wind Up Minidress

JamieLynnSpears/Instagram

Jamie Lynn Spears' tiny little sundress is blowing the heck up and showing legs that rival sister Britney's. The 29-year-old actress and sister to 39-year-old pop princess Britney Spears made it a very leggy affair on Thursday, posting for her 2.1 million Instagram followers with an adorable on-set moment from hit Netflix series "Sweet Magnolias" – Jamie Lynn was talking about the show, but she included daughter Ivey in the video. It was all legs and one very windy day. Check it out below.

JamieLynnSpears/Instagram

Scroll for the video. It comes as Jamie Lynn makes headlines both for backing Britney amid The New York Times' "Framing Britney Spears" documentary and, like half of American right now, battling winter storms. The "Zoey 101" alum's post threw things back to warmer days though, ones seeing her filming "Sweet Magnolias" and rocking the very convincing fake baby bump seen on character Noreen.

Fake pregnant ladies can be leggy ladies, as this video proved, with Spears seen in sunlight, amid crew, and with her gorgeous little girl in her arms.

JamieLynnSpears/Instagram

Jamie Lynn, wearing a paisley and floral-print minidress with half sleeves and float effect fabrics, kept it practical in flat sandals, with the star's gorgeous legs taking center stage as she looked around the set and held a curious-looking Ivey. A caption, meanwhile, made it Throwback Thursday, with Spears writing:

"#TBT to my last day of rockin’ Noreen’s baby bump for season 1 of #SWEETMAGNOLIAS ??
I get asked all the time how it was working on this show, and I can honestly say that it’s a DREAM job..."

JamieLynnSpears/Instagram

Gushing about her time on the show, one that's now been renewed for a second season, the Nickelodeon alum added:

"From the cast, the crew, the wonderful environment they create for us to get to do what we love, and to the amazing fans who make it all possible...THANK YOU! I do not take any of it for granted at all, and can’t wait to start season 2 VERYYYY soon." She then gave a "look how little Ivey was" shout-out to her daughter. See more photos after the video!

JamieLynnSpears/Instagram

If you aren't aware "Sweet Magnolias" was a giant hit before it even aired. Spears actually had to apologize to fans after Season 1's Live Watch party crashed online – so many people tried to tune in, it fell apart. The feel-good series also caused a stir during filming as fans were convinced that baby bump was real and that Spears, already a mom to daughters Maddie and Ivey, was expecting her third.

Meanwhile, sister Britney has been hiking massive hills in tiny shorts. Scroll for it!