Barbara and Pam will be reliving the soap's most memorable storylines as part of EastEnders: Back to Ours, which will kick off in the run up to the live 30th anniversary week.
Launching exclusively on BBC iPlayer, Barbara will look back at her moments as the Queen Vic landlady Peggy Mitchell, while Pam will be discussing her time as Pat Evans.
"I had such great fun filming this with Pam," said Barbara. "At times we completely forgot we were being filmed and we got terribly carried away. In fact, we got quite outrageous!"
Meanwhile, Pam said: "What fun - not only catching up and chatting with Babs but being surrounded by friends and crew from the EastEnders production team - it was like coming home!"
Fans can see even more of Barbara as she makes a return to EastEnders next month for the live anniversary week.
Other actors confirmed to take part in EastEnders: Back to Ours are: Adam Woodyatt and Laurie Brett, Shane Richie and Jessie Wallace, Nitin Ganatra and Himesh Patel, Rita Simons and Samantha Womack, and Diane Parish, Tameka Empson and Rudolph Walker.
EastEnders: Back to Ours will launch on 27 January.
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