For one week, Katie Couric will return to her former home at NBC's 'Today show' as co-anchor alongside Matt Lauer during the first week of January. Couric is reportedly filling in for current co-anchor Savannah Guthrie, who is on maternity leave. Couric previously anchored the 'Today Show' for 15 years, from 1991 to 2006, before leaving for CBS Evening News. According to NBC, she'll be on during the week of January 2, along with Lauer, her former longtime co-host on the program.