She welcomed her only child with Michael Sheen when she was only 25-years-old.
And over two decades later, Kate Beckinsale has taken to Instagram to send wishes to her daughter, Lily Sheen, on her 21st birthday.
The 46-year-old Beauty shared a series of old and new photos of her stunning look-alike daughter, calling her a 'fairy person.'
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All grown up! Kate Beckinsale took to social media to wish her daughter, Lily Sheen, a happy 21st birthday on Saturday
'Happy 21st birthday, you amazing fairy person,' she began.
'I love you my Lily, and your smaller than the rain hands. Happy birthday, funniest,best,most brilliant angel face ❤️'
And in true Kate form, she ended the note with a hilarious line.
Mini-me: The photos saw Lily a very much look-a-like to her famous mother
Throwback: Kate even posted some baby photos of her young daughter
'ps please feel free to finally try a sip of alcohol for the first time.'
And while Kate encouraged a 'sip of alcohol' to her now legal daughter, she recently shared that she herself doesn't drink any alcohol or caffeine.
'I think some people's systems are just a bit sensitive to things,' she explained her reasoning to Women's Health last month.
'If you told me you had nausea yesterday, I might start throwing up myself. If I ate too much dark chocolate, it would be like someone else taking cocaine.'
Clean and sober: And while Kate encouraged a 'sip of alcohol' to her now legal daughter, she recently shared that