04/19/2012 at 10:00 AM EDT
Jennifer Love Hewitt has admitted she likes her boobs
. Still, she was fairly horrified to see them super-sized up close on Wednesday.
Appearing on Jimmy Kimmel Live!
, the actress, 33, was discussing her mildly racy billboards for The Client List
when Kimmel, 44, surprised her by having in a giant section of billboard featuring only her cleavage brought into the studio.
"No! No!" cried Hewitt, amused but mostly embarrassed, as stage hands placed the giant image behind her chair. "Seriously, that looks like a horror movie, blown up like that ... They look like King Kong's."
Kimmel joked that he was going to send the section of the ad to Hewitt's grandmother in Texas, who evidently hasn't seen the campaign.
"I'm waiting for that phone call, and I'm hoping it won't happen," says Hewitt.