J.Lo's ab-baring Instagram has everyone fawning -- including a famous ex!

Jennifer Lopez's latest Instagram post is so hot that it has one of her famous exes coming out of the woodwork to react to it publicly.

The star, 49, took to Instagram to share an update with her fans on the ninth day of her 10-day Challenge (made popular by 10-Day Detox Diet by Dr. Mark Hyman), and she looked absolutely incredible in the impressive shot.

Clad in leggings, a bra and a beanie -- all of which are from her J.Lo x Niyama Sol collection -- the singer flaunted her washboard abs, toned arms and famous curves in the sexy shot.

"Day 9 and feelin'... like I can't wait for Day 10", she captioned the cosy snap.

J-Lo

Of course, her followers flooded the comments section to praise the photo, but there were two comments that were particularly of note when scrolling through. The first came from boyfriend Alex Rodriguez, who commented, "lucky me".

The second was more surprising: Lopez's ex-boyfriend, Diddy, took to the comments to share how impressed he was with the photo: "OMG" he wrote along with a heart-eyes emoji.

Lopez and Diddy famously dated from 1999 through 2001, though their romance became embroiled in scandal after the pair were involved in a nightclub shootout in 1999, which got them both arrested -- and eventually acquitted. Lopez also insinuated that Diddy wasn't faithful to her, though the pair has since proven that they still respect one another fully.

"Puffy -- he'll always be Puffy to me", Lopez said back in 2014 while reflecting on their relationship. "We spent three years of our lives together, almost every single day... And as much as he roots for me, and as proud as he is of me and of the time we had together, I am just as proud to see what he's done."

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Jennifer Lopez's sexiest Instagrams
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Jennifer Lopez's sexiest Instagrams
I’m a hustler baby... I just want you to know... #Ramona on fire 🔥 On set and in character for #hustlersmovie #stxentertainment
Day 9 and feelin’... like I can’t wait for Day 10. 😅 Who’s still with us? @arod #10DayChallenge #NoSugarNoCarbs @niyamasol #niyamasol #jloxniyamasol
Day 4 & feeling..... a lil better :) Who’s with me? #10daychallenge #NoCarbsNoSugar
New year, new goals! 💪🏼you always ask me how to stay motivated and focused on my goals...new workout gear always works for me!😉😉 Link to shop this @NiyamaSol look in my story. #NiyamaSol #JLoxNiyamaSol
And we’re off... ✈️ 📸 by: @steviemackey
December 2018 @instylemagazine
December 2018 @instylemagazine
I loved @niyamasol’s post yesterday about judging less and loving more. My life and career are centered around my passions and doing things that make me happy. These are the latest from my Vanguard collection called Love?..if you can see they feature lyrics to On the Floor. We never quit, we never rest on the floor. Gettin it in today and everyday...get yours!!! 💪🏼 #jloxniyamasol - click the link in my story or bio to buy NOW!
Feeling like superwoman after the show tonight! When I started this run I thought omg 15 shows in 27 days that’s a lot... but I made a promise to myself that instead of letting it wear me down I would be even stronger at the end of it...I will work out and be in the best shape of my life... There were moments I was tired and there was travel and I had to fit in my workouts where I could... but here we are with only 3 shows left!! And I am having so many emotions but mostly just feeling strong, happy and grateful!!! #allihavefinal15 #3showstogo #we’renotdoneyet #letsgoooo #makepromisestoyourselfandkeepthem
Everything’s just peachy 🍑 #tangerinedream #peachesNCream #topnaughty #suitsandfruits #throwingshades #doublebuns Knot your average peach 🍑 To peach their own 🍑 Practice what you peach 🍑 😂
📸 @alexilubomirski
I know you guys have seen me living in my @Niyamasol leggings, I mean I wear them everywhere...LOL! Let me tell you why I have fallen in love...Niyama means positive habits for a healthy and spiritual way of life, values we can all stand by. Plus they're an entirely green company! Besides having the best fit out there, ALL of their clothing is made from recycled plastic!! 🚨 SUPER COOL NEWS ALERT 🚨: When they heard about my MTV Video Vanguard award, they took my stan-dom to the NEXT level…so I’m so excited to announce TODAY they are dropping a tribute collection inspired by my music and career!! Jennifer Lopez X Niyamasol for YOU! ♥️ Every month through 2018 we will release a new design starting with the VANGUARD legging and matching top!! This company’s spirit and mantra touched my heart & soul and I can’t wait to see these on YOU, go to my stories and swipe up to see the entire collection and don’t forget to show me your #Mysolstyle #JLONiyamasol
Sunset serenity... #priceless 📷 by: @lacarba 🇮🇹
Island vibezzz... 🏝 #vacaciones
#SundayFunday kind of... 😉 gotta get it in... now let the fun begin!! #birthdayweekbegins @niyamasol
Gettin’ it in today even though it’s blazing outside!! @niyamasol white snakeskin leggings!! #mysolstyle #hotlikeamf #109degrees
Good night everyone 💋
World of Dance press day!! 💃🏽 Season 2 premiere on May 29th!!! #disruptive
Lady in Red...goodnight everybody 💋💋💋 #Allihave #JLOvegas
Up and at ‘em rise and shine... about to get in this workout in my new leggings...Thanks @niyamasol !!!! #gettingitin
Good night/Good Morning 🌓
Hiyeee...🌸
Peaceful moments... #priceless 📷by @lacarba
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