When you stumble upon a beauty product that's got the seal of approval from Kendall Jenner, not to mention style icons like Victoria Beckham, Rosie Huntington-Whitely, Blake Lively and Margot Robbie, you'd be forgiven for thinking it would break the bank. So imagine my joy when I found out that one product I use daily, that's relatively affordable, is also a regular feature in many celeb beauty routines.