The reality TV stars, who are both born and bred Essex girls, dressed to kill for their mate date - and happily posed for a boozy selfie on Twitter.
Both dressed in head-to-toe black, the girls looked stunning as they sipped on their drinks and perused a lunch menu at the Shepherd & Dog pub in Romford.
Alongside the picture of the two pals, Celebrity Big Brother star Casey wrote the message: "Lovely catch up with @Daniarmstrong88 drinks are flowing!!!! Xx."
Danielle added: "My aim today to get very drunk."
Sounds like our sort of evening!
After a bite to eat, the girls headed to TOWIE's most famous nightclub Sugar Hut, owned by former star Micky Norcross.
In a series of snaps, Casey and Danielle can be seen letting their hair down with friends, including Danielle's sister Lannen.
During the fun evening, Danielle tweeted: "Having a great time in @sugarhut with @CaseyBatchelor thank u @micky_norcross #GirlsNight."
Although Casey once dated Mikey's son Kirk, the Essex lad was nowhere to be seen in the pictures.
It's no surprise to us that Danielle and Casey seem to be such firm friends... While Casey was left in tears during CBB because of Lee Ryan's behaviour after the pair kissed, Danielle has also suffered public humiliation in TOWIE.
After months of denials, her boyfriend James Lock recently admitted he HAD slept with other girls while they've been together.
Did you know Casey Batchelor and Danielle Armstrong were friends? Tell us below!