Celebs getting starstruck by other celebs.
Tiffany Haddish meets Meryl Streep.
Jack Nicholson surprises Jennifer Lawrence.
Kelly Clarkson and Catherine Zeta-Jones are fans of each other.
Anne Hathaway fangirls over Mariah Carey.
Emilia Clarke loves Matt LeBlanc.
Emma Stone is a Spice Girl fan. Mark Hamill makes Adam Scott tremble.