Janet Jackson shows off her weight loss, rocks out at first post-baby show: See the pics!

One hot mama! Janet Jackson was back in action on Thursday at the opening night of her State of the World tour in Lafayette, Louisiana. 

The 51-year-old pop icon showed off her post-baby body and slimmed down frame on stage in a series of form-fitted ensembles. 

Janet Jackson starts her 'State of the World' tour
Photo: Splash News

Jackson wore her long locks high up in a ponytail while busting a move in tight jeans, knee-high boots, and a fitted white sweater. She also rocked a black bodysuit with a cinched belt.

See more photos of Janet Jackson:

40 PHOTOS
Janet Jackson's Style Transformation
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Janet Jackson's Style Transformation
The youngest of the Jackson clan, Janet sits squeezed in between brothers Randy and Michael. 
Young Janet loved plaid! Here she stands with brother Michael at the American Music Awards.
Some of the Jackson Family poses together at the Annual Television Parade of Stars in 1977, with a wee Janet in the front.
Janet poses for a photo shoot featuring "The Jacksons," wearing a cute striped "Good Buddy" sweater.
Jump ahead just five years and Janet looks like a grown up at the 10th Annual American Music Awards in this red tiered strapless ball gown.
Janet and her sister LaToya look like they're attending an '80s prom, but nope -- it's the '85 American Music Awards instead.
We can certainly see a bit of her brother's influence here, with Janet's all-black ensemble and leather gloves.
Janet sure loves that key earring -- here she is dressed in all navy for the presentation of platinum records for her album "Janet Jackson's Rhythm Nation 1814" and two singles.
Janet shows off her bra and abs at the First Annual Billboard Music Awards.
Janet poses with her brother Michael at the Grammy Awards, dressed in a white suit.
The MTV Video Music Awards typically attracted casual attire, but this is taking it to the next level... into ho-down territory.
Janet dressed up a bit more for the 1997 MTV Video Music Awards, wearing a long maxi dress and tight red jacket to match her red curls.
Janet wore a metallic corset to the Source Hip-Hop Music Awards.
We're not sure why this choice was made, but this dress is just plain scary.  There is such thing as "too much leather," and this dress is beyond too much leather!
Janet attended the 28th Annual American Music Awards in this cream silk wide-legged suit.
We think Janet is channeling Britney Spears with this tight sheer dress and pink hat. 
We can see the fashion editors cringing at the 2002 Vanity Fair Oscar Party as Janet rolled in wearing this midriff-baring top and oversized coat.
Janet looked stunning for the 2002 Essence Awards in this silk halter gown.
Comfortable in silk, Janet attended a celebration of her new album "Damita Jo."
Menswear-inspired, bra showing... are we seeing a trend?
Yes, looks like we are.  Janet wore this button down over a black skirt to the 32nd Annual AMAs.
Now that's better! Janet dressed up for the 2005 Vanity Fair Oscars party, and we are sure the fashion editors rejoiced that year.
We'll never understand the skirt-over-pants look (or dark-brown-with-black), but Jermaine Dupri didn't look much better than Janet at the ASCAP Pop Music Awards.
Janet Jackson wore a red Bill Blass gown to the 2006 CFDA Awards.
Janet looked lovely in this simple black dress for the Songs of Hope event.
Menswear-inspired for sure, Janet went for a mid-length dress to match her new haircut at the Billboard Music Awards.
Janet attended the "Why Did I Get Married?" screening in all black with white cuffs.
Janet emphasizes her tiny waist at the 39th NAACP Image Awards.
Janet attends the opening of the Los Angeles Alexander McQueen store, wearing a bright dress made by the designer himself.
Janet stands with Prince Azim in London, wearing boyfriend jeans and a white jacket.
Another menswear-inspired outfit, Jackson attended the Giorgio Armani Fashion Show during Milan Fashion Week.
Janet looked stunning in Alexander McQueen during the premiere of "Why Did I Get Married Too?"
Janet attended the premiere screening of "Why Did I Get Married, Too?" in London, wearing a sheer top.
Janet wore head-to-toe Haider Ackerman to the premiere of "For Colored Girls."
Janet looked stunning as she attended amfAR's Cinema Against AIDS Gala during the 64th Annual Cannes Film Festival in 2011.
Janet visits Jay Leno, wearing a lovely LBD and Christian Louboutins.
Jackson wore this Alexander McQueen jacket to the Marco Glaviano "Supermodels" exhibition opening at the Keszler Gallery in New York City. 
Janet stands with Wissam al Mana in her go-to menswear inspired look with braids in her hair, attending the Giorgio Armani fashion show during Milan Fashion Week.
Janet is seen in an all-white ensemble with lace up heels.
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Thursday marked Jackson’s first live performance since giving birth to her son Eissa in January. The GRAMMY winner had previously postponed her tour to have her little boy.

In August, ET reported that Jackson was hard at work getting back in performance shape. 

Janet Jackson on tour
Photo: Splash News

"She has lost more than 65 pounds and has her pre-baby body back and then some," a source told ET at the time. "It's a grueling schedule but she is up to the task.”

21 PHOTOS
Shocking celebrity weight-loss transformations
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Shocking celebrity weight-loss transformations

Mama June in 2017

The "Honey Boo Boo" star documented her weight loss journey on her very own reality show! She is now down to a size 4 -- and she looks incredible!

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Mama June in 2013

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Khloe Kardashian in 2012

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Khloe Kardashian in 2016

Hard work does pay off! The youngest Kardashian sister is obsessed with exercising and documents all her workout sessions on social media.

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Lena Dunham in 2015

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Lena Dunham in 2017

The "Girls" star lost a significant amount of weight after going on a holistic diet to help alleviate symptoms of endometriosis. 

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Wendy Williams in 2012

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Wendy Williams in 2017

The TV personality revealed in 2015 that she lost 50 pounds over the course of three years with a healthy diet that doesn't include refined sugars, meat, dairy or "eating after dark." It looks like she's been committed to the strict diet. She looks better than ever in 2017!

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Ricki Lake in 2010

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Ricki Lake in 2011

The actress lost 20 pounds when she appeared on "Dancing With the Stars" in 2011.

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Jordin Sparks in 2008

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Jordin Sparks in 2017

Hard work pays off! "American Idol" alum began her weight loss journey by walking around her neighborhood and the rest was history! Her favorite workout? Zumba.

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Sara Rue in 2003

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Sara Rue in 2016

The "Rules of Engagement" star is a total fan of Jenny Craig for its simplicity. She looks incredible and totally glowing!

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Jonah Hill in 2014

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Jonah Hill in 2017

Talk about a transformation! Hill has lost weight and gained weight through the years -- depending on the movie he's working on -- but his latest transformation is absolutely jaw-dropping.

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Christina Aguilera in 2012

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Christina Aguilera in 2013

Smoke show! The songstress dropped 20 pounds over the course of one year. Doesn't she look incredible?!

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Miranda Lambert in 2012

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Miranda Lambert in 2013

The country crooner slammed critics who accused her of having weight loss surgery. She revealed that she dropped the pounds the old-fashioned way -- eating right and working out with her trainer!

(Getty)

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