Gavin & Stacey star Laura Aikman kept her surprise finale cameo so hush-hush, she didn't even tell her own family until they watched it together on Christmas Day.
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Aikman, who plays the widely disliked Sonia, was so committed to her NDA that she managed to keep her appearance in the 90-minute special a total secret from her loved ones.
The actress posted a video of herself watching the finale with her family, capturing their shocked reactions as she made her surprise return to the cult BBC series.