The Hollywood star was seen with John and British beauties Amal and Emily at Kazu Sushi in Studio City in Los Angeles.
The foursome appear to be close friends as they were seen hugging each other outside the restaurant before parting to go home.
George Clooney and Amal Alamuddin
New mum Emily, who gave birth to her first daughter Hazel in February, kept her looked casual, sporting blue jeans and a grey cardigan over a blue and white striped t-shirt.
Emily Blunt gives birth to daughter Hazel
Lawyer Amal opted for a more glamorous look, teaming snake skin-patterned trousers with a black top and towering white wedges.
Emily Blunt and John Krasinski
George previously worked with John on 2008 movies Leatherheads and the two have remained good friends ever since.
George Clooney takes new girlfriend Amal Alamuddin on safari
Amal's relationship with George appears to be going form strength-to-strength and her dinner date with his close friends follows a their Tanzania safari holiday two weeks ago.
Emily, John and George at the Critics Choice Awards in 2013
George was first spotted dining with Amal in October last year and the pair have begun to attend more events together, including a special screening of George's latest film The Monuments Men in the White House.
The safrai trip was the couple's first holiday away together and a source revealed to People magazine that Amal is someone who he connects with.
"He's with someone who is a very accomplished attorney. She isn't someone who is pursuing a career in acting or entertainment," the source said. "She's on his level."