Rose Byrne isn't getting much sleep following the birth of her first child.

Olivia Wilde and Rose Byrne

Olivia Wilde and Rose Byrne

The 'Bridesmaids' actress made her first official red carpet appearance since welcoming two-month-old Rocco with partner Bobby Cannavale and revealed she is "nearly" at her goal weight.

She said: "I'm feeling good. I'm not getting that much sleep, but that's alright! It goes with the territory. I'm nearly there. I went to the gym yesterday, which was exciting. I haven't done that for a while!"

And Rose's close pal Olivia Wilde was also walking the carpet at the Marimekko for Target launch event, where she revealed Rocco and her 23-month-old son Otis have "no choice but to be friends".

Olivia added to E! News: "Otis has seen videos of Rocco trying to crawl. And Otis is saying, 'Go Rocco go.' They have no choice but to be friends.

"The four of us are going to force them to be friends so they might as well give into this arranged friendship."

Meanwhile, Bobby previously revealed he was "so tired" following the birth of the little one.

He said at the time: "You know, I didn't do anything. We [fathers] don't do anything and I'm so tired. I think I've gained 28 pounds since Monday.

"I mean, I'm not kidding you. Like, this jacket fit so well, like, last Thursday. But I've been eating so much."