7 February 2017 Last updated at 07:41 GMT
Nikki is also a vlogger and spends a lot of time on the internet.
So for Safer Internet Day, we thought it was a great opportunity to speak to her about how she stays safe online and deals with "haters" who say nasty things.
Check out her interview with Ricky to see what she had to say...
You may recognise Nikki from CBBC's Junior Bake Off, which she won last year.