Michelle Dockery is expecting her first child with husband Jasper Waller-Bridge.

The actress, 43, made the announcement by showing off her growing baby bump in a flowing, sky blue off the shoulder gown with a matching transparent cape at the “Downton Abbey: The Grand Finale” premiere on Wednesday evening.

Dockery beamed while arriving at the red carpet event in London’s Leicester Square alongside Waller-Bridge — the brother of “Fleabag” creator Phoebe Waller-Bridge — who donned a black suit with a dark blue shirt and tie for the occasion.

Dockery accessorized with jeweled earrings and metallic pump heels, and was seen stepping onto the carpet while an assistant gathered the elegant folds of her dress to help her pose.

A rep for the actress did not immediately respond to Page Six’s re

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