Jacqueline, 21, is expecting her first baby with TOWIE star Dan Osborne and dressed up as a black cat earlier this week.
Along with an all-black outfit, the actress painted a feline nose and whiskers on her face, adding dramatic smokey eye make-up and bright red lips.
Jacqueline then finished off her look by styling her long brunette hair into two sleek buns, in an attempt to resemble cat ears.
Halloween might not be until Friday, but it's never too early to get into the spirit. Eh, Jac!
Meanwhile, Jacqueline gave fans an update on her growing baby bump yesterday (27 October) while at work on the EastEnders set.
Taking to Twitter, the expectant mum confirmed that her soap character Lauren Branning's jeans no longer fitted her.
Considering Jacqueline is more than five months gone, we think she's done well to squeeze into them for so long!
Jacqueline and Dan's baby is due in February. Last week, Jacqueline shared a cute scan picture of their unborn child.