'American Pie' star Coolidge and 'The Hangover' actor Jeong will play Brittany's (Heather Morris) parents in the final season of the Fox comedy, reported Variety.
Jeong posted a photo of himself with Coolidge, Morris and producer Michael Hitchcock earlier this week.
The pair join fellow new cast member Gina Gershon, who will play the mother of Blaine (Darren Criss), named Pam Anderson.
'Glee' will bring back multiple fan-favourite characters for its final season, in addition to introducing five new students.
New episodes will see Rachel Berry (Lea Michele) and Kurt Hummel (Chris Colfer) facing opposition from Sue Sylvester (Jane Lynch) when they return to McKinley High to re-launch the New Directions.