Jennifer Lopez reveals the moment in her show that makes her cry every time

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EXCLUSIVE: Jennifer Lopez Reveals the Moment That Made Her Cry During Her Las Vegas Show

Jennifer Lopez kicked off her highly anticipated Las Vegas residency at Planet Hollywood Resort and Casino on Wednesday night to rave reviews, and ET was there to talk to the stunning 46-year-old star about hitting such a big career milestone.

"It was so much fun," Lopez said about her spectacular show, admitting that the experience was a bit overwhelming. "First I'm back here, and I'm on my staircase with my big Versace feather thing, and then I walk here and it was like, 'Woo! This is your life.'"

WATCH: Jennifer Lopez Gets Justin Bieber Singing Along as She Kicks Off Las Vegas Residency in a Sexy Fashion

But aside from all the spectacle -- including eight super sexy costume changes, with Swarovski crystals covering the bare essentials -- it's actually a quiet moment in the show that had J.Lo in tears. Lopez sweetly dedicated Lee Ann Womack's "I Hope You Dance" to her two children with ex-husband Marc Anthony, 7-year-old twins Emme and Max.

Click through to see J.Lo's sexiest residency looks:

20 PHOTOS
Jennifer Lopez Las Vegas Residency
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Jennifer Lopez reveals the moment in her show that makes her cry every time
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez performs during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (L) performs with a dancer during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (C) performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (C) performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (C) performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (C) performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez performs during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (C) performs with dancers during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez (R) performs with a dancer during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Singer/actress Jennifer Lopez performs during the launch of her residency 'JENNIFER LOPEZ: ALL I HAVE' at The Axis at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - JANUARY 20: Jennifer Lopez performs during the debut of her residency show JENNIFER LOPEZ: ALL I HAVE at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
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"You know what, in rehearsal every time I sing the damn song I get choked up," Lopez admitted to ET. "Like, the dancers, they know me, the band they're like, 'She's going to cry again.' I can't help it. It makes me emotional to think about them."

Of course, J.Lo's big night wasn't all work and no play. The "Waiting For Tonight" singer's after-party at Mr Chow restaurant in Caesers Palace was a star-studded event, with plenty of her close friends making an appearance. Justin Bieber, Derek Hough, Alicia Vikander, Nicole Scherzinger, Ne-Yo, Rosie Huntington-Whiteley, Casey Affleck, Gina Rodriguez, Wilmer Valderrama, her co-stars Ryan Guzman and Ray Liotta, and her BFF, Leah Remini, were all in attendance, where they were served lobster and Dom Perignon 2006 champagne, a source inside the party tells ET.

Later in the evening, Hough started a dance circle in the middle of the main room, which stars like Vikander and Ne-Yo loved, the source adds. Hough also spent a lot of time chatting with Seacrest, his sister Julianne Hough's ex-boyfriend.

Click through for more photos of the stunning star:

29 PHOTOS
Jennifer Lopez through the years
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Jennifer Lopez reveals the moment in her show that makes her cry every time
Jennifer Lopez perform on stage at Morocco's biggest music event, Mawazine Festival in Rabat, Morocco, Friday May 29, 2015. (AP Photo/Abdeljalil Bounhar)
The actresses who will portray slain Tejano singer Selena, in an upcoming Warner Bros "Selena," pose together at a news conference June 18. Portraying the younger Selena is ten year old Becky Lee Meza of Texas and Jennifer Lopez (R) as the adult Selena.
UNDATED PUBLICITY PHOTOGRAPH-FOR USE WITH STORY BC-ENTERTAINMENT-STONE - Actress Jennifer Lopez portrays housewife 'Grace McKenna" in director Oliver Stone's latest film "U-Turn" in this undated photograph. "U-Turn" also stars Sean Penn and is currently in release in the United States. After flopping dismally at the box office with his last serious political film, Oliver Stone is hoping to re-ignite his career with the age-old staples of sex, lust, greed, betrayal and murder. ENTERTAINMENT STONE
Presenter and nominee Jennifer Lopez shows off her latest fashion at the 42nd annual Grammy Awards in Los Angeles February 23. Lopez was nominated for Best Dance Recording for her song ["Waiting For Tonight".]
Singer Jennifer Lopez performs "Love Don't Cost A Thing" at the 28th Annual American Music Awards January 8, 2001 at the Shrine Auditorium in Los Angeles.
Actress and singer Jennifer Lopez makes her way down the red carpet as she arrives at the 74th Academy Awards March 24, 2002 in Hollywood. Lopez is a presenter at this years ceremony. REUTERS/Fred Prouser MB/ME
Actress Jennifer Lopez arrives at the Mann National Theatre in Westwood for the premiere of her new movie "Gigli, July 27, 2003. Lopez and boyfriend Ben Affleck play mob enforcers involved in the kidnapping of a prosecutor's brother in order to help save a mob boss from going to prison. The movie opens August 1. REUTERS/Mike Blake MB
U.S. singer and actress Jennifer Lopez arrives for the worldwide premier of Pepsi's latest advertisement in Madrid, February 23, 2005. U.S. singer Beyonce Knowles, England soccer captain and Real Madrid star David Beckham and Jennifer Lopez all starred in the advert. REUTERS/Andrea Comas ACO/GB
Jennifer Lopez waves to the crowd as she opens the first-ever "World of JLO" shop in the U.S. in Marshall Field's Chicago State Street Store September 22, 2005. The shop houses the entire JLO and Sweetface collections, intimates, fragrances, jewelry and accessories. REUTERS/John Gress
U.S. singer and actress Jennifer Lopez arrives for Dolce & Gabbana Fall/Winter 2006/07 women's collections show at Milan Fashion Week February 23, 2006. REUTERS/Damir Sagolj
Singer Jennifer Lopez arrives for the Metropolitan Museum of Art Costume Institute Benefit Gala "Anglomania" at the Metropolitan Museum of Art in New York May 1, 2006. The gala presents a range of work by British fashion designers. REUTERS/Keith Bedford
Singer Marc Anthony and wife, singer and actress Jennifer Lopez, arrive at the 7th annual Latin Grammy Awards in New York November 2, 2006. REUTERS/Lucas Jackson (UNITED STATES)
U.S. actress and singer Jennifer Lopez smiles during a news conference to present her film 'Bordertown' running in competition at the 57th Berlinale International Film Festival in Berlin February 15, 2007. The festival runs from February 8-18. REUTERS/Arnd Wiegmann (GERMANY)
Singer Jennifer Lopez performs during the 2007 Fashion Rocks Concert at Radio City Music Hall in New York September 6, 2007. REUTERS/Lucas Jackson (UNITED STATES)
Singer and actress Jennifer Lopez poses at the premiere of the movie "The Curious Case of Benjamin Button" at the Mann's Village theatre in Westwood, California December 8, 2008. The movie opens in the U.S. on December 25. REUTERS/Mario Anzuoni (UNITED STATES)
Jennifer Lopez smiles on stage after being announced as one the judges for the 10th season of the television show "American Idol" at the Forum in Inglewood, California September 22, 2010. The new season begins on FOX January 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
Singer Jennifer Lopez arrives at the 53rd annual Grammy Awards in Los Angeles, California February 13, 2011. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT) (GRAMMYS-ARRIVALS)
Singer Jennifer Lopez accepts the Favorite Latin Music Artist award at the 2011 American Music Awards in Los Angeles November 20, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (AMA-SHOW)
Singer Jennifer Lopez performs during a concert that is part of her "Dance Again World Tour" in Berlin October 13, 2012. REUTERS/Thomas Peter (GERMANY - Tags: ENTERTAINMENT)
Actress and pop star Jennifer Lopez arrives with boyfriend Casper Smart at the 70th annual Golden Globe Awards in Beverly Hills, California January 13, 2013. REUTERS/Jason Redmond (UNITED STATES - Tags: Entertainment) (GOLDENGLOBES-ARRIVALS)
Singer and actress Jennifer Lopez blows a kiss at photographers as she poses on her star after it was unveiled on the Walk of Fame in Hollywood, California June 20, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
Singer Jennifer Lopez performs "First Love" onstage at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES-Tags: ENTERTAINMENT)(BILLBOARDAWARDS-SHOW)
Judge Jennifer Lopez reacts as balloons fall during the American Idol XIII 2014 Finale in Los Angeles, California May 21, 2014. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (AMERICANIDOL-SHOW)
Jennifer Lopez performs "Booty" during the 42nd American Music Awards in Los Angeles, California November 23, 2014. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (MUSIC-AMERICANMUSICAWARDS-SHOW)
Singer Jennifer Lopez wears a gown by Elie Saab as she arrives at the 87th Academy Awards in Hollywood, California February 22, 2015. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) (OSCARS-ARRIVALS)
Actress Jennifer Lopez and singer Harry Connick Jr attend Fox's American Idol XIV Finalist Party at The District Restaurant in Los Angeles, California March 11, 2015. REUTERS/Jonathan Alcorn (UNITED STATES - Tags: ENTERTAINMENT)
Singer Jennifer Lopez arrives at the 2015 Billboard Music Awards in Las Vegas, Nevada May 17, 2015. REUTERS/L.E. Baskow
Actress Jennifer Lopez arrives at the 73rd Golden Globe Awards in Beverly Hills, California January 10, 2016. REUTERS/Mario Anzuoni
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As for Lopez herself, she mostly stayed in the private room with Remini and her boyfriend, choreographer Casper Smart, who our source says was "attentive" to his superstar girlfriend.

WATCH: Casper Smart Gushes About Jennifer Lopez at Vegas Residency Opening -- 'She Is Wonder Woman'

Watch the video below for more on J.Lo's big night!

Justin Bieber, Rebel Wilson Freak Out Over J.Lo's Opening Night in Vegas

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