The 29-year-old actress is expecting a baby, due May 4, with fiancé and former Saturday Night Live star Jason Sudeikis.
"I'm just as nervous as anybody nominated," Sudeikis, who will present an award, told Ryan Seacrest.
Wilde joked about her Oscars fitting last month on Twitter:
Pic from my Oscar fitting: pic.twitter.com/VrNkD41DCc— olivia wilde (@oliviawilde) February 19, 2014
[Just Jared, Us Weekly]