Helen George and Jack Ashton looked picture perfect as they enjoyed a glamorous night out at the ATG Summer Party, which was held at Kensington Palace on Monday.The Call the Midwife star - who is pregnant with the couple's second child - proudly displayed her blossoming baby bump in a midnight blue dress, which featured tiered detailing and a thigh-high split.MORE: Call the Midwife's Helen George looks glowing in stunning new holiday photoWATCH: Helen George in Call the Midwife season tenSoaking