Gemma was all smiles as she was pictured arriving at her bash, which was being filmed at High Beech, Epping Forest, on Wednesday afternoon (4 March).
I'm A Celebrity... Get Me Out Of Here! star Gemma wore a flattering black maxi dress from ASOS Curve, £55, and beamed from ear-to-ear as her tumbling blonde locks draped over her shoulders.
Best friend Bobby Norris had helped Gemma to get glam for the celebration by giving her roots a touch up!
Gemma celebrated the global event with her co-stars, including Bllie Faiers, who looked sensational in a slinky halterneck dress, and Bobby, who turned up in blue heels!
And, it looked Gemma was quite the party planner with plenty of balloons and champagne at the ready for her co-stars to celebrate in style!
During last night's episode, Gemma cried tears of joy after getting a visit from ex-boyfriend James 'Arg' Argent, who apologised for any hurt he may have caused her in the past.
Arg, who returned to the ITVBe reality show last week following his suspension last year, told Gemma: "I feel you're one of the main people I hurt. I'm here because I want to make amends and say how sorry I am. I think when I was going through the start of my dark phase, it started before we started seeing each other."
He added: "My selfishness and actions obviously had a big effect on you. Looking back on it now I should have kept you there as a good friend. I shouldn't have played with your emotions, given you mixed signals and strung you along. I hope you forgive me and understand."
An emotional Gemma replied: "I'm crying because I'm happy for you, that you're in this place. You've made my day."
All you need to know about TOWIE's Gemma Collins: