"The fact that she's coming to give us a week of her time — she could be doing anything — is a testament to the show that we have built," Bush Hager exclusively tells PEOPLE

After Kotb departs her longtime role as co-host of 'Today' this week, Bush Hager will be joined by various celebrities.

As “Today” fans prepare to say goodbye to Hoda Kotb, Jenna Bush Hager is sharing who will replace her co-host and friend during the fourth hour of “Today.”