Amanda Holden and Tracy Ann Oberman have joined 'Plebs'.
The 'Britain's Got Talent' judge and 'Friday Night Dinner' actress will appear in the ITV2 sitcom, which follows the comical lives of ancient Rome residents Marcus (Tom Rosenthal) and Jason (Jonthan Pointing), and their slave Grumio (Ryan Sampson), and the pair appear to be having a great time on set.
Amanda took to Instagram to share a picture of her and Tracy posing alongside one another, and she added the caption: "Filming an Epic Roman Comedy with this one @tracyanno #Bulgaria 80' hair we don't care #maxine & #vera (sic)"
She also shared a short clip of the pair dancing around pillars in their Roman regalia, and joked they resembled former Russian pop duo t.A.T.u., who were made up of Lena Katina and Julia Volkova.
Amanda wrote: "Evidence that the Romans hired a t.A.T.u tribute act to celebrate their invasion of Britain @tracyanno #me #bulgaria
"Non reticemus #Roman #Mandyius #Holdenupmylegius #filming #comedy #glamious @didoni11 #christinecant (sic)"
Tracy also made a quip about the pals' pictures resembling a new t.A.T.u. album cover.
She wrote on Twitter: "We even made our own #Tatu album cover @AmandaHolden you too much fun. (sic)"
Paul Mortimer, ITV's head of digital channels, confirmed in August that 'Plebs' will be returning for a fifth series in 2019, with series four regulars Tom, Ryan and Jonathan set to return.
What's more, 'Superbad' star Seth Rogen is said to be keen to adapt the show for the big screen.
Last year, a source said: "'Plebs' has been a massive hit for ITV2 and is gaining fans all over the world including Australia."
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