Demi Lovato is missing Britney Spears on 'The X Factor' USA.

The 'Heart Attack' singer formed close ''bonds'' with the 'Hold It Against Me' hitmaker and fellow judge L.A. Reid when they worked together on the hit singing competition last year, but she is excited to work with new judges Kelly Rowland and Paulina Rubio, who will replace on the show this year.

Speaking to Digital Spy, she said: ''I do miss them. We spent a lot of time together and we'd formed those bonds, but it's a new chapter now and I'm excited to start a new experience with new people.''

Britney, 31, signed a sensational $15 million deal to appear on the show but left after just one season on the judging panel alongside Simon Cowell, Demi and L.A.

Meanwhile, Reid, 56, quit his role on the show after two seasons to concentrate on running his Epic Records music label.

Although Demi misses her former colleagues, the 20-year-old star has already hit it off with former Destiny's Child star Kelly, 32, after filming auditions for the new season last week, and says they had ''instant'' chemistry.

She said: ''Kelly is so much fun to work with. She's got a great energy about her and we connect really well. It was just an instant, off-the-bat kinda thing.''

Demi also praised Latin singer Paulina, 41, adding: ''Paulina is doing great as well - she's really, really huge in South America and I'm glad the show is representing that side of things more.''