Jennifer Grey couldn't have been prouder on Saturday as she looked back over the past two decades of her life.MORE: Elizabeth Hurley inundated with support as she reveals injuryThe Hollywood star was in a reflective mood as she marked her only daughter Stella's 20th birthday.Taking to Instagram, the doting mom shared a gorgeous headshot of her lookalike child, alongside a heartfelt message."I love this person. Happy birthday my darling Stella.