“He’s constantly reminding me to rest,” Dewan tells PEOPLE at the Baby2Baby Mother’s Day Celebration Presented by Aquaphor Baby at The Grove Jenna Dewan is praising her fiancé, Steve Kazee, for all his support during her third pregnancy. While speaking with PEOPLE at the Baby2Baby Mother’s Day Celebration Presented by Aquaphor Baby at The Grove, Dewan, 43, says Kazee, 48, …