Olympic athlete Michelle Jenneke sparks controversy over her breasts

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One track and field superstar is attracting attention at the Rio Olympics for something other than her skills.

Do you remember Michelle Jenneke?

SEE MORE: Everything you need to know about the Summer Olympics

She's the Australian hurdler who went viral at the World Junior Championships in 2012 -- and stole everyone's hearts -- over her adorable warm-up dance.

The 23-year-old athlete is making headlines again, but this time for an eyebrow-raising reason.

Some Instagram users are calling out the brunette beauty over her noticeably perky assets, alleging that she has had some work done.

Last session completed! All systems are go 😄 #Australia #Rio2016 #Olympics #hurdles #2days #greenandgold

A photo posted by Michelle Jenneke (@mjenneke93) on

"Boob job for sure there's no way that it's a push up bra," a critic wrote.

Another also put their two cents in: "Surely she's had help there?"

See Michelle Jenneke's hottest Instagram snaps:

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Michelle Jenneke's hottest Instagram snaps
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Michelle Jenneke's hottest Instagram snaps
First week of training in Florida done and dusted and only 3 more days till I leave for Rio!!! #Australia #Olympics #Rio2016 #excited
Cruising around the Whitsundays ⛵️#hamiltonisland
Swapped a day at the track in my running gear for a day at a wedding in a dress yesterday :) Congratulations Ryan and Mimi ❤️
Race day... Semi 2, lane 8, 7.33pm 😄 Just waiting around till I head to the track... #Beijing2015 #Aussie
Love that I can go for a recovery beach swim after my races today even though it's the middle of winter... Thank you Queensland 😊 #sunshinecoast #winter #Australia
Looking forward to racing this weekend for the first time since nationals! Time to see if all the training has been paying off 😀
@lonsdaleau #lonsdaleLFX
Chilling out between filming for the Nutri-Grain sports star showdown @nutrigrainau #coolhat @fatwhalefins 📷 @kendrickjlouis
Join ‘The Movement’ it could save your life! Testicular Cancer Survivor Pat Ryan, has a simple message which could save your life ‘Get Em Checked’ visit www.duffycounselling.com/the-movement/ to find out more and buy a T-Shirt like mine, to spread the word and support the cause. #themovement
Awesome day at Rottnest Island, WA
Beautiful day to spend at the dog beach 🐾 #summer #beach #dog #buckethat
Go on the rope swing they said, it will be fun they said... Check out how it ended on my sister's video - http://youtu.be/eb00szuvefs
Thanks to @hoopnotica for hooking me up with some travel hoops! How do you mix up your training sessions for a bit of fun? #itsallinthehips #hoopnotica #training
Flashback photoshoot - Behind the scenes at the Sports Illustrated shoot in Las Vagas @si_swimsuit @sportsillustrated #bikini #flashback #sportsillustrated #SI #vegas #photoshoot
Sports Illustrated Swimsuit '13 Check out all my photos at http://sportsillustrated.cnn.com/2013_swimsuit/athletes/michelle-jenneke/index2.html #SI #sportsillustrated #swimsuit #sportsillustratedswimsuit #bikini
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But one user came to the Aussie athlete's defense, saying her ample cleavage is due to her sports bra.

"When guys don't know how sports bras or bras in general work lol."

While Jenneke has remained tight lipped about the matter, this may be nothing new to her. She has gained notoriety since she broke into the scene in 2012 for her looks. The track star was even dubbed the Anna Kournikova of the Rio Olympics.

But come on ... this boob controversy is probably the last thing on Jenneke's mind. It's game time for the athlete as her journey to Olympic gold begins on Tuesday in the first round of the women's 100-meter hurdles.

UPDATE:

Michelle Jenneke finished in 37th place with a time of 13.26 seconds in the first round of the women's 100-meter hurdles. She did not qualify to move on to the next round, ending her bid for Olympic gold.

RELATED: Best images from the 2016 Olympics:

41 PHOTOS
Best photos from the 2016 summer Olympics
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Best photos from the 2016 summer Olympics
RIO DE JANEIRO, BRAZIL - AUGUST 07: Simone Biles of the United States competes on the balance beam during Women's qualification for Artistic Gymnastics on Day 2 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 7, 2016 in Rio de Janeiro, Brazil (Photo by David Ramos/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 07: Jonas Valanciunas of Lithuania shoots over Marcus Vinicius Marquinhos of Brazil during a Men's preliminary round basketball game between Brazil and Lithuania on Day 2 of the Rio 2016 Olympic Games at Carioca Arena 1 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Pool/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 07: Segun Toriola of Nigeria plays a Men's Singles second round match against Koki Niwa of Japan on Day 2 of the Rio 2016 Olympic Games at Riocentro - Pavilion 3 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Mike Ehrmann/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Bret Bonanni #10 of United States shoots the ball against Croatia during the Men's Water Polo Preliminary Round - Group B match between the United States of America and Croatia at the Maria Lenk Aquatics Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Tom Pennington/Getty Images)
Anna Marton of Hungary, right, fences against Manon Brunet of France during women's saber individual fencing competition in the 2016 Summer Olympics in Rio de Janeiro, Brazil, Monday, Aug. 8, 2016. (AP Photo/Gregory Bull)
Russia's Middle Khamukov Petr is punched by Venezuela's Albert Ramon Ramirez during a men's light heavyweight 81-kg preliminary boxing match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 7, 2016. (AP Photo/Frank Franklin II)
Hungary's Katinka Hosszu competes in a women's 100-meter backstroke heat during the swimming competitions at the 2016 Summer Olympics, Sunday, Aug. 7, 2016, in Rio de Janeiro, Brazil. (AP Photo/Martin Meissner)
RIO DE JANEIRO, BRAZIL - AUGUST 07: Laura Giombini of Italy (R) reacts during the Women's Beach Volleyball preliminary round Pool D match against Jamie Lynn Broder and Kristina Valjas of Canada on Day 2 of the Rio 2016 Olympic Games at the Beach Volleyball Arena on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Shaun Botterill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 07: Robert Gardos of Austria plays a Men's Singles second round match against Ovidiu Ionescu of Romania on Day 2 of the Rio 2016 Olympic Games at Riocentro - Pavilion 3 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Mike Ehrmann/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 07: Shu-Ching Hsu of Chinese Taipei competes during the Women's 53kg Group A weightlifting contest on Day 2 of the Rio 2016 Olympic Games at Riocentro - Pavilion 2 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)
Italy's Pietro Zucchetti, left, and teammate Ruggero Tita attend a training session of the 49er Men event during the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 7, 2016. (AP Photo/Gregorio Borgia)
Argentina's Federico Pizarro tries to score a penalty during the men's preliminary handball match between Denmark and Argentina at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 7, 2016. (AP Photo/Matthias Schrader)
Belgium's Laura Waem performs on the balance beam during the artistic gymnastics women's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 7, 2016. (AP Photo/Julio Cortez)
2016 Rio Olympics - Beach Volleyball - Women's Preliminary - Beach Volleyball Arena - Rio de Janeiro, Brazil - 07/08/2016. Doaa Elghobashy (EGY) of Egypt and Kira Walkenhorst (GER) of Germany compete. REUTERS/Lucy Nicholson
RIO DE JANEIRO, BRAZIL - AUGUST 08: Lilly King of the United States celebrates winning gold in the Women's 100m Breaststroke Final on Day 3 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 8, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)
France's Rudy Gobert, right, fights for a rebound with China's Zhou Qi (15) and Yi Jianlian, rear, during a basketball game at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Monday, Aug. 8, 2016. (AP Photo/Charlie Neibergall)
United States' Katie Ledecky competes in a semifinal of the women's 200-meter freestyle during the swimming competitions at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Monday, Aug. 8, 2016. (AP Photo/David J. Phillip)
Norway's Sanna Solberg tries to score past Spain's goalkeeper Darly Zoqbi during the women's preliminary handball match between Spain and Norway at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Monday, Aug. 8, 2016. (AP Photo/Ben Curtis)
RIO DE JANEIRO, BRAZIL - AUGUST 09: Michael Phelps (L) of the United States leads Chad le Clos of South Africa in the Men's 200m Butterfly Final on Day 4 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 09: Simone Biles of the United States competes on the balance beam during the Artistic Gymnastics Women's Team Final on Day 4 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)
Russia's Ekaterina Birlova casts a shadow on the sand as she serves to Poland during a women's beach volleyball match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016. (AP Photo/Marcio Jose Sanchez)
Germany's Karin Schnaase stretches during a badminton training session at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016. (AP Photo/Kin Cheung)
RIO DE JANEIRO, BRAZIL - AUGUST 09: Ruolin Chen and Huixia Liu of China compete in the Women's Diving Synchronised 10m Platform Final on Day 4 of the Rio 2016 Olympic Games at Maria Lenk Aquatics Centre on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 10: Ning Ding of China in action during the Womens Table Tennis Singles Final match against Li Xiaoxia of China at Rio Centro onn August 10, 2016 in Rio de Janeiro, Brazil. (Photo by Matthias Hangst/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 10: Axel Augis of France competes on the horizontal bar during the Men's Individual All-Around final on Day 5 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 10, 2016 in Rio de Janeiro, Brazil. (Photo by Matthias Hangst/Getty Images)
Members of team Cuba attempt to block a ball spiked by Iran's H. Milad Ebadipour Ghara during a men's preliminary volleyball match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Thursday, Aug. 11, 2016. (AP Photo/Matt Rourke)
France's Lauren Rembi reacts after losing to Russia in a women's epee team fencing quarterfinal competition at the Summer Olympics in Rio de Janeiro, Brazil, Thursday, Aug. 11, 2016. (AP Photo/Gregory Bull)
RIO DE JANEIRO, BRAZIL - AUGUST 14: Linda Cerruti and Costanza Ferro of Italy compete in the Women's Duets Synchronised Swimming Free Routine Preliminary Round on Day 9 of the Rio 2016 Olympic Games at Maria Lenk Aquatics Centre on August 14, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 13: Jennifer Oeser of Germany competes in the Women's Heptathlon Long Jump on Day 8 of the Rio 2016 Olympic Games at the Olympic Stadium on August 13, 2016 in Rio de Janeiro, Brazil. (Photo by Alexander Hassenstein/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: Matthew Glaetzer of Australia competes in the Men's Sprint Qualifying on Day 7 of the Rio 2016 Olympic Games at the Rio Olympic Velodrome on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 14: Usain Bolt of Jamaica competes in the Men's 100 meter semifinal on Day 9 of the Rio 2016 Olympic Games at the Olympic Stadium on August 14, 2016 in Rio de Janeiro, Brazil. (Photo by Cameron Spencer/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: An RS-X athlete is seen on the way back to the marina after the conclusion of racing on Day 7 of the Rio 2016 Olympic Games at Marina da Gloria on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Mason/Getty Images)
United States' Gabrielle Douglas performs on the uneven bars during the artistic gymnastics women's apparatus final at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, Aug. 14, 2016. (AP Photo/Dmitri Lovetsky)
Bahamas' Shaunae Miller, left, beats United States' Allyson Felix, second right, to win the women's 400-meter final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Monday, Aug. 15, 2016. (AP Photo/Martin Meissner)
Athletes compete in a men's 400-meter hurdles semifinal during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Tuesday, Aug. 16, 2016. (AP Photo/Charlie Riedel)
Russia's Darya Klishina makes an attempt in the women's long jump qualification during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Tuesday, Aug. 16, 2016. (AP Photo/Matt Slocum)
RIO DE JANEIRO, BRAZIL - AUGUST 17: Silver medalist Nia Ali (L) and gold medalist Brianna Rollins of the United States celebrate after the Women's 100m Hurdles Final on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil. (Photo by Shaun Botterill/Getty Images)
Canada's Andre De Grasse, left, and Jamaica's Usain Bolt smile at each other in a men's 200-meter semifinal, during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Wednesday, Aug. 17, 2016. (AP Photo/Matt Dunham)
RIO DE JANEIRO, BRAZIL - AUGUST 20: Russia compete during the ribbon rotation 1 in the group all-round qualification round at the at Rio Olympic Arena on August 20, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 19: The riders compete during the Men's semi final 2 on day 14 of the Rio 2016 Olympic Games at the Olympic BMX Centre on August 19, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 19: Yauheni Karaliou of Belarus competes during the Diving Men's 10m Platform Preliminary on Day 14 of the Rio 2016 Olympic Games at the Maria Lenk Aquatics Centre on August 19, 2016 in Rio de Janeiro, Brazil. (Photo by Al Bello/Getty Images)
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