The 25-year-old took to Instagram to reveal how she was spending the day of love, sharing a tender moment between Greg and his baby girl.
Alongside the adorable black and white snap, Billie wrote: "Daddy and his little #Valentine"
Billie then uploaded a picture of her with Greg, writing: "Happy Valentine's Day to my love, my sweets and my best friend in the whole world… (Apart from Nelly)… Love you forever xxx"
Obviously, with it being the day of love, there had to be some treats involved.
Later, TOWIE star Billie posted a picture of three delicious looking chocolate cakes.
She added: "Just made chocolate cupcakes for my sweets… #valentine #valentinesday"
Billie and businessman Greg announced they were expecting Nelly in January 2014, and revealed their engagement just a few weeks later.
Now, a year on, they're excitedly planning their wedding. Speaking to OK! magazine recently, Billie said they'll be having "A big, Essex white wedding. Greg did want it in the Maldives but basically we can't expect everyone to fly all that way and we know they'll be so many people who want to come to our wedding."