Spencer was joined by his best mate and former co-star Hugo Taylor to join Caggie for celebratory drinks at her party on King's Road, Chelsea.
Caggie, who wore two outfits from the collection during the bash, previewed her latest fashion line to guests. The ISWAI pop-up shop will be open at its location on King's Road (340 King's Road, Chelsea, London, SW3 5UR) until Saturday, 6 September.
Judging from the photos, it's clear to see that Caggie and Spencer are still incredibly close as they shared a private joke while posing for photographers.
Caggie, who appeared on MIC from series one to three, embarked on a brief romance with Spencer during her time on the show. Despite their relationship being short-lived, the pair have remained the best of friends.
In May this year, lothario Spencer told Reveal that Caggie has always been the love of his life.
"She's the girl that I would want to marry," he told us. "She's the only girl in fact that I think I could be totally faithful too. I'd love to marry her."
He continued: "I see Caggie all the time. Whenever she's in trouble or has a problem, she usually comes to me and I do my best to make her feel better, which is rare because she's a very happy person. I really care about her."
Spencer has been a strong supporter of Caggie's ISWAI brand since the very beginning, and last week, he proudly wore one of her designs as they posed on the pavements of Chelsea.
Catch Spencer in MIC:NYC on Sunday 7 September at 9pm on E4.
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MIC:NYC trailer below: