The British singer announced the pregnancy on Monday, hours before debuting her bump on the red carpet for the Attitude Awards at London's Trafalgar Square.
During the ceremony, Halliwell was presented with an award from fellow Spice Girl, Emma "Baby Spice" Bunton.
The mom-to-be posted a pic from the friends' "amazing night" out on Instagram. "She presented me my @attitude award," Halliwell captioned a sweet photo of Bunton's hands on her hands baby bump. "Felt so good to share the joy. #mamaspice."
The pregnancy pics didn't stop there. Bunton Instagrammed a photo with Halliwell as well, which she captioned, "Congratulations to my gorgeous friend @therealgerihalliwell Another #SpiceBaby on the way!"