Rose had kept the happy news under wraps until now but she couldn’t contain her excitement, or glow, on this girls night out with Girls star Lena Dunham and comedians Julia Louis-Dreyfus and Amy Schumer.
The gorgeous snap of the tight trio, together with Amy’s stylist Leesa Evans, was posted simultaneously on Instagram by the comedy squad, with Julia captioning her snap, ‘Wake up internets’.
Rose, 36, also made her first red carpet appearance since the baby started to show, attending a screening of Spotlight with her brother George Byrne on her arm.
Although she was careful to cover her growing bump with her jacket, a clearly glowing Rose looked radiant at the event and after party in minimal makeup and her thick hair in a relaxed blowout, say reports.
It will be the first child for Rose who is keeping herself busy in the build-up filming Neighbors 2 with Josh Rogan.
Her boyfriend of three years, Boardwalk Empire star Bobby Cannavale, has a 20-year-old son Jake from a previous relationship.
Rose and Bobby me on the set of Annie in 2012. They’ve also gone on to work together on comedies Spy and Adult Beginners.
But Rose and Bobby kept their romance low-key, until Bobby called Rose the “the love of my life” while accepting his Emmy for Outstanding Supporting Actor for his role as Gyp Rosetti on the HBO drama in 2013.
Another insider says the lovebirds are clearly in nesting mode now, buying a three-bedroom house in New York for $2.2million earlier this month.
Rose previously dated Australian actor Brendan Cowell for six years before splitting in 2010.
The popular Aussie actress told Elle Canada last year that romance didn’t come easy for her but she was working on it!
“To be honest, I’m not naturally that much of a romantic person,” she said. “Australians don’t like making a fuss.
“I have trouble with things that feel very manufactured, like Valentine’s Day. I’m trying to get better at romance.”