TV presenter Mark, 26, looked his usual dapper self in fitted jeans teamed with a sky blue shirt and his famous butter-wouldn't-melt smile when he arrived at the fashion event in Birmingham's NEC.
Jessica, meanwhile, got into the festive spirit in a cute penguin jumper, which she sexed up with a pair of wet-look skinnies.
It's no wonder that both siblings have their own fashion ranges - Mark for Littlewoods and Jessica her own brand, With Love Jess.
In fact, Mark was eager to tell his Twitter followers that he was wearing his own range, posting: "a smart baby blue shirt & jeans from my @Goodsouls_Uk range. Buy my clothes at http://littlewoods.com." Nice plug, Mark!
Mark and older sister Jess, 28, were joined at the Clothes Show Live by their younger sister Natalya, their mum Carol and the most famous granny in Essex, Nanny Pat.
Hopefully, there wasn't an awkward encounter with former TOWIE star and Mark's ex, Lauren Goodger, who was also at the event.
Lauren was there to promote her own product range, Lauren's Way.
She gave an interview about her collection and her plans for expanding her brand in the future.
Do you like Jess' cute penguin jumper? Tell us below!