Gemma posted a series of pictures at the celebration to her Instagram page.
In the first picture she can be seen with Mark Charnock, who plays Carly's ex-boyfriend Marlon Dingle, and Amelia Flanagan, who plays Marlon's daughter April.
She can also be seen taking a picture with Amy Walsh, who plays Tracy Metcalfe.
Gemma captioned the post: "Fab night catching up with the Emmerdale gang celebrating @missmichellehardwick wedding to the beautiful Kate. Such a fun party.
"Short and sweet for me as I'm already home chilling with Mia (Rock N Roll). I drove home with the biggest smile on my face after seeing everyone though.
"Happy memories from a wonderful job."
Michelle commented: "Thank you SO much for coming over! It was gorgeous to see your beautiful face xxx."
Fans were quick to comment saying how they would love to see Gemma return to the ITV soap.
One wrote: "Hope you are back to Emmerdale soon, they'd have you back in a heartbeat."
Wish you'd go back to Emmerdale, loved you in it.
A second commented: "Wish you'd go back to Emmerdale, loved you in it."
A third said: "Fantastic photo. When are you coming back for Marlon?"
A fourth added: "Seems to be a theme in the comments - everyone wants you to be Carly again - me included."
Fans of Emmerdale will remember Gemma played Bob Hope's daughter Carly for two years.
During her time in the village, Carly had a relationship with Marlon and became close to his daughter April.
However, the pair eventually split and she ended up leaving the village with ex-boyfriend Matt.
Would you like to see Gemma return to Emmerdale as Carly? Leave us a comment on our Facebook page @EntertainmentDailyFix and let us know what you think!