Rosie met Keeping Up With The Kardashians star Kylie at a party to celebrate Kylie's new role as global ambassador for Nip + Fab skincare products.
A picture posted to Rosie's Instagram showed the girls cosying up together. The caption read: "I just met this absolute beauty @kyliejenner at her tea with@nipandfab. She is an absolute babe!"
It seems Rosie had a bit of difficulty deciding on her wardrobe for the occasion. Well, it's not every day you meet a Kardashian-Jenner sister, right?!
Tweeting before the event, Rosie said: "Ahh what outfit do you wear to meet @KylieJenner?"
As well as chatting over tea, Rosie and Kylie also posed for photos together on the red carpet. Earlier in the day, Kylie had attended the official photocall announcing her position as global ambassador.
It was a whirlwind visit to London for Kylie, who only stayed on our showers for two days.
She was pictured flying back to LA on Sunday, 15 March, the day after her Nip + Fab party.
Why is Kylie Jenner famous? Find out below!
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!