The singer has revealed her former Destiny's Child band mate's mum played a big role in advising her to wait until she was absolutely sure before having surgery to enlarge her breasts - and she ended up waiting a decade.
Speaking to Shape magazine, she said: ''I wanted to get breast implants when I was 18, but my mom and Beyoncé's mom told me to really think about it first. I took their advice and waited 10 years.''
To make sure she was completely comfortable with how her body ''would feel'', the 'X Factor' USA judge wore padded bras to get an idea of how she'd be after the surgery.
She added: ''Once I felt ready, I tried on padded bras and walked around in them to see how it would feel.
''You have to know what you're getting, no matter what type of surgery it is.''
Kelly wasn't the only member of the former trio - completed by Michelle Williams - to have worries about her body.
Earlier this year, Michelle revealed while she was ''trying to gain weight'', Beyoncé thought her thighs were ''too big''.
She recently said: ''On the outside, we were poised and smiling. But behind the scenes we had issues.
''I was trying to gain weight, and meanwhile Beyoncé would say, 'I think my thighs are too big.' ''
The singer introduced "the next generation" in Iceland.
Jack Antonoff hears a ''female voice'' in his head when he writes music.
The show will be seen by everybody at the same time.
The Scottish comedian has been speaking about gaining a knighthood in the Queen's Birthday Honours List.
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