Jennifer Lopez has broken Britney Spears' Las Vegas box-office record.

Jennifer Lopez

Jennifer Lopez

Last week Jennifer, who kicked off her 'All I Have' show at the Axis at Planet Hollywood earlier this year, earned over $1 million in ticket sales in a single night, the first performer at the Caesars Entertainment property to do so.

Britney's 'Piece of Me' show, at the same venue, previously held the record, according to the Las Vegas Review Journal.

Before kicking off her residency in Sin City, Jennifer admitted she checked out Britney's concert.

She said: "I have no ego about things. I love going to other people's shows. I've been to Justin Bieber's not too long ago; I've seen Britney Spears' show here.

"I go to whatever. I think sometimes there's an ego there like, 'I'm not going to go see that'. But for me, I like to see every show I can."

Jennifer also opened up about how her show came together, admitting when she first performed the whole thing together for the first time with her dancers, they ended up throwing up.

She said: "I love what I do. When I put it together, I thought I'd put it together section by section and then I thought this is a great section, this is a great section, this is a great section.

"And then all of a sudden we had all these sections and when we did them back to back all the dancers were throwing up and it was so hard and I was like, 'Oh my God! What have I done?' But then everybody was like, 'It's amazing!'"