Christina, 35, and Tarek, 37, were seen shooting scenes in Anaheim, California.
The mother-to-be, who is expecting her first child with husband Ant later on this year, showed off her tiny baby bump in a long-sleeved top.
It's the second time that Christina has been seen out ever since she announced her joyous pregnancy news on Friday, March 22.
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Tarek appeared unbothered while standing next to his ex-wife. He repeatedly checked his phone on set while sporting a blue polo and dark pants.
Do you think Tarek is really happy for Christina? Sound off in the comments.