Nicky Hilton Rothschild has a bun in the oven — again! The French Sole fashion designer is pregnant with her and her husband James Rothschild’s third child, her rep reportedly confirmed to People. The couple is due to welcome their little one during the summer. The soon-to-be parents-of-three tied the know in the summer of 2015 at Kensington Palace and share daughters Lily Grace Victoria, 5, and Theodora “Teddy” Marilyn, 4. PARIS HILTON & NEW HUBBY CARTER REUM ESCAPE ON THEIR HONEYMOON AFTER HIS SECRET LOVE CHILD IS REVEALED Nicky, 38, previously gushed over being a mom in the pandemic, explai…