Savannah Guthrie is back on TV. The “Today” show host said “good morning” on Thursday’s episode after abruptly leaving the show halfway through the previous day. Without explaining her sudden exit, Guthrie introduced the day’s news coverage while sitting beside Willie Geist, who was sitting in for Craig Melvin. Today/NBC Today/NBC “Good morning and welcome to ‘Today’ — so happy you’ve gotten up with us this morning — ‘what, like it’s hard, Willie?'” she said, referencing her favorite movie, “Legally Blonde.” “I can’t say that line enough!” the 54-year-old added as Geist noted her “giddiness this morning.” “Our chief ‘Legally Blonde’ correspondent,” he called her before reminding her that she had previously dressed up like Elle Woods for Halloween. “I love ‘Legally Blonde,’ I connect with this character and now we get to see her in high school,” Guthrie gushed, talking about the upcoming prequel show, “Elle,” which is set to premiere in July on Amazon Prime.…