The ladies looked jaw-droppingly good when they arrived at London restaurant Gilgamesh on Saturday night (30 May).
Birthday girl Luisa - who will turn 28 on 4 June - chose a pretty white lace dress and nude sandals for her big night out.
Casey, meanwhile, opted for a nude bodycon frock from online retailer AX Paris.
It's not surprising the girls became such firm friends when they took part in Celebrity Big Brother in 2014... They both know how to make the best of their assets!
Glamour model Casey made sure she shared lots of snaps of the night on social media.
She tweeted: "Lots of love for this beautiful lady @luisazissman bday dinner and drinks for her xxx."
She later added: "@luisazissman bday dinner with the gang at @gilgameshlondon #Happybday #GoodTimes."
Fellow CBB star and Blue singer Lee Ryan was also present at the birthday dinner... Despite Casey and Lee's brief fling ending very badly during the reality TV show.
We're glad they're friends again!
Casey later met up with Geordie Shore's Vicky Pattison at Missoula bar in Romford.
Posting a cosy snap together, Casey tweeted: "I love this lady @vicky_gshore."
No doubt Casey needed a good night out after what must have been an emotional week for her...
In an interview with The Sun, she opened up about childhood depression and how it drove her to attempt suicide at the age of 15.
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