EastEnders introduced a new character earlier this week and used a genius bit of casting that some eagled-eye viewers were able to spot.
On Wednesday's episode (May 18), Zack and Nancy met with estate agent Melissa to sign the lease on their new restaurant space.
However, as Zack and Nancy were meeting with Melissa, Janine was also meeting with an estate agent while posing as Nancy.
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Janine told the estate agent that she wouldn't be going ahead with the deal as she and Zack had ended their relationship. Meanwhile, the real Nancy and Zack were agreeing to pay Melissa £50,000 to make sure they got the lease.
Later, Janine was seen meeting with Melissa who was revealed to be an old friend, who had just helped her pull off a huge scam.
But Melissa, who was played by actress Katharine Bennett-Fox, looked very familiar to some viewers and it turns out she's no stranger to a scam.
The actress was recognised from Barclays' digital scam advert, where she played a woman posing as a Barclays employee and taking customers' bank details.
On Twitter, fans loved the cheeky casting, with one viewer writing: "Not this icon turning up in EastEnders to scam the residents of Walford," alongside side-by-side images of Katharine's characters scamming in the soap and in the ad.
Another added: "Obsessed with that scam advert woman iconically playing a scammer helping Janine on #eastenders. So camp, need to see more of her."
Janine's scam on Zack and Nancy is set to lead to a huge, new storyline airing in June.
While details are being kept under wraps, we already know of more to come in Janine's feud with Linda thanks to some spoiler paparazzi pics from filming last month.
EastEnders airs on Mondays, Tuesdays, Wednesdays and Thursdays at 7.30pm on BBC One and streams on BBC iPlayer.
Read more EastEnders spoilers on our dedicated homepage
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