Jessica and Mark have a close bond but busy schedules and work commitments often mean they don't see as much of each other as they would like to.
However, yesterday evening (14 October), the siblings were able to hang out together after being invited to the same bash in London.
Jess and Mark were pictured enjoying a drink at the do, which was held to celebrate celebrity agent Jonathan Shalit's recent OBE, and they even got to brush shoulders with other famous faces too.
During the event, the brother and sister got talking to former X Factor judge Tulisa Contostavlos and together the trio posed for a photograph.
While Jess looked cute and comfortable in a grey dress from her own With Love Jessica range, N-Dubz star Tulisa opted to flash a little more flesh by wearing an off-the-shoulder monochrome number.
Mark, meanwhile, looked ever the dapper gent in a smart navy jumper teamed with a white shirt and dark jeans.
It's been a busy time for both Mark and Jessica lately. While Jess is currently filming the latest series of TOWIE, Mark is attempting to wow the Strictly Come Dancing judges with his moves on the dance floor.
Given this, we think they both deserved a night off and a good old brother and sisterly catch up!
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