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18th October 2017
07:23pm BST

"Congratulations - seems like your family is going to get a new little member!"Another added:
"Baby bump! Beautiful Laura! Congrats to you and @mrsamclaflin"Someone else commented:
"ahhh yay congrats to my fav couple sending so much love your way!!"A different fan said:
"Congrats Laura !! So happy for you both and the little man who will become big brother."
It's not the first time that the couple, who tied the knot in a private ceremony in 2013, announced their happy news on the red carpet.
Laura debuted a blooming bump when she stepped out for the London premiere of The Hunger Games: Mockingjay - Part 2 in November 2015.
The pair welcomed their first child together a month later.
Images via Getty. Explore more on these topics: