Nicole Scherzinger blasts rumors she cheated on her boyfriend Grigor Dimitrov with Calvin Harris earlier this year (16) as "ridiculous".

Nicole and Calvin were spotted arm-in-arm leaving London nightclub Tape in July, weeks after the DJ's split from Taylor Swift, and soon sparked speculation they were dating.

However, the 38-year-old X Factor judge slammed the reports that she was cheating on her boyfriend, Bulgarian tennis player Grigor Dimitrov, with Calvin.

"It was all, 'She’s the biggest cheater', I’m like, excuse me? I was walking on cobblestones, almost fell, grabbed him, two frames and that was it. It’s ridiculous," she told Glamour magazine.

Nicole has been dating 25-year-old Grigor since July last year (15), and said the key to their successful relationship was they work at it.

"I am happy. I’m in a really good, solid, more balanced place in my life. I’ve grown a lot as a woman," the singer explained. "My grandma always used to say, to find the person you wanna marry, you have to find the person you wanna work on your relationship with for the rest of your life. That’s the key word: work."

Nicole has bounced back from the heartbreak of her on-again/off-again romance with Formula 1 champion Lewis Hamilton, after the pair finally called it quits in February, 2015.

Aside from the talk of her love life, the Don't Hold Your Breath hitmaker joked about her disappointment at losing out on the role of C.J. Parker to Kelly Rohrbach in the forthcoming Baywatch movie.

Nicole trained daily to get herself in shape for the role made famous by Pamela Anderson in the 90s TV series, but was pipped to the post by 26-year-old model Kelly.

"I started this year working out every day, motivated to get my butt in shape because I was determined I was gonna be the new Baywatch girl. I was hell-bent, I’m an ocean angel, I love it," she recalled. "I was devastated. What is my year, what is my life, if I’m not in Baywatch?!"