Jennifer Lopez Reveals the Moment In Her Show That Makes Her Cry Every Time

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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.

"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.

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!

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