Goodwin, 32, and Kern, 34, have been dating for two years, USMagazine.com reported.
"Yup, it's definitely true!" a source told USMagizine.com. "Joey emailed all his friends … and gave them the good news."
Kern helped design the engagement ring, the Web site said.
The couple plan to be married in the fall.
2014: The Year in Music [PHOTOS]