Pregnant Sofia Richie and her husband, Elliot Grainge, are getting in some nights out before they welcome their first child! The couple dressed to the nines for the Sunday, February 4, Grammy Awards, which are taking place in Los Angeles. The soon-to-be mom kept her look simple in a black long-sleeved dress, and she had her blonde locks slicked back in a neat bun. Grainge matched his wife in head-to-toe-black. When the model revealed her pregnancy last week in a Vogue interview, she admitted she won’t be “tapping into maternity wear.” “I’m also not buying an entirely new wardrobe for this preg…