What happens in Vegas doesn't always stay in Vegas, especially when J.Lo is concerned!

On Monday's episode of The Ellen DeGeneres Show, the comedy queen Ellen DeGeneres explains that she had quite the weekend when she hit up Sin City recently in a failed (and funny) attempt to be Jennifer Lopez's understudy for her glittering "All I Have" residency at The Axis at Planet Hollywood Resort & Casino.

Watch as Ellen, wearing a hilarious costume, visits J.Lo in her dressing room to inform the "Jenny From the Block" singer that she's going to be her go-to gal in case of emergency.

Jennifer then gently tries to break the news to the host with the most that the role as a back-up doesn't exist.  Rolling with the punches, Ellen then asks the 48-year-old to show her how she gets in gear for the high-octane, dance-heavy show that's filled with thrills, chills and a whole lotta choreography.

But Ellen didn't just get a behind-the-scenes peek into the dancing diva's prep for her show, she also got a front-row seat to Jennifer's show.

At one point, Ellen asks Jennifer to give her a shout out during the concert, requesting that she call her "Lil Ellen" so as to distinguish her from the other Ellens in the crowd—and that's just what happens!

The video also shows a clip of Ellen welcoming the Planet Hollywood audience at the beginning of the concert and also her big moment when Jennifer throws "Lil Ellen" her sparkly New York Yankees hat.

If all Ellen has is that—blinging hat, she's a lucky gal!

Check it out when The Ellen DeGeneres Show airs at 3 p.m on NBC.

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