You want pickles with that?

After showing off her baby bump in a two-piece bikini over the weekend, Uma Thurman continued her impromptu babymoon in St. Barts on Monday.

Pregnant with her third child, the Oscar-nominated actress and former model, 41, covered up in a flowy green dress and fulfilled her cravings with an ice cream cone -- a waffle cone, to be exact! Her baby-to-be's dad is Arpad Busson, her financier beau of five months, with whom she reunited late last year.

"They definitely weren't trying," a source says of the on-and-off pair, who called off their engagement in 2009. "The engagement isn't back on," the source says. "For now they're just trying to be happy."

Thurman's companion for the ice cream run, however, was Levon, her 10-year-old son with ex-husband Ethan Hawke. She and Hawke also have a daughter, Maya, 13. Before Sunset star Hawke, 41, is also father to Clementine, 3, and Indiana, 5 months, his daughters with second wife Ryan Shawhughes.