09/21/2011 at 01:00 PM EDT
When you're at the Playboy Mansion, wild things can happen.
and Eddie Cibrian were involved in some serious monkey business Tuesday, when they visited the famed property to film a segment for Entertainment Tonight
with Hugh Hefner.
"Sweet lil things!" Rimes Tweeted
, posting a picture of her husband gazing at the primates. The monkeys live in an enclosure at the Los Angeles estate, and Cibrian, whose new series The Playboy Club
debuted on Monday, even let one of the monkey's shake his hand through the cage.
The mansion is home to squirrel monkeys, spider monkeys and tamarins, according to
Hefner's ex, Holly Madison. Over 100 species of birds – including peacocks – also call the mansion home.
Now that Cibrian has ventured to the mansion to meet some monkeys, will Hefner wander over to The Playboy Club
to meet a few retro Bunnies?
"I won't be making any guest appearances on The Playboy Club,
" Hefner Tweeted
Tuesday. "Because the show is set in the early 1960s."