Greg has not appeared on The Only Way Is Essex before, but now he and Billie are expecting a baby together, he has decided to take part in the show.
In the first episode of the new series, Greg and Billie threw a baby shower to celebrate their happy news at Nu Bar in Loughton, Essex.
During the party, Greg made an announcement to their guests, telling them that he and Billie had got engaged during their recent holiday in the Maldives.
He said: "When we were recently on holiday in the Maldives, I asked Billie to marry me. Luckily she said yes and I'm over the moon."
Greg, who works as a ticket broker, added: "Hopefully the wedding will be sometime next year."
Billie and Greg also revealed to their family and friends that they are expecting a girl. But rather than just tell them, they cut a cake and said the colour of the sponge would reveal their baby's sex.
Slicing into the cake, the room cheered as Billie showed everyone it was pink. Aww!
Meanwhile, also in the TOWIE series 11 premiere, Ferne was left furious after Charlie accused her of cheating on him before they split up last year.
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