In a rare photo of the siblings together the pair can be seen smiling contentedly wearing matching white t.shirts with a make-up free Georgia displaying her gap-tooth grin proudly.
In another snap of the pair, the model looks more like her glam self hanging out with her brother and their friend, writer Brett Grace.
Georgia, 29, who relocated to the US in 2019, captioned the collection: “Lucas in LA.”
“Love uuuu,” Lucas replied in the comments, adding, “Can’t wait for our next trip.”
Lucas, 22, is of Mick’s eight children whom he has with five different women and bares a striking resemblance to the Rolling Stones frontman.
He is the love child of Mick and Brazilian model Luciana Gimenez after they had a brief romance.
Their romance only played out for eight months but their secret love child was the “final straw” for his then-wife Jerry.
DNA tests proved Lucas was Jagger’s son, which ended Jerry and Mick’s relationship after 22 years together.
The Rolling Stones star Mick is also now a great-grandfather as his family has continued to expand.
Georgia, who has been the face of Rimmel London, has had a glittering modelling career with campaigns for Victoria Secret, Vivienne Westwood and Tom Ford among others.
Her brother Lucas, who is trying to break into film directing, is no stranger to being in front of the camera either and shocked fans by sharing photographs from his hospital bed after he had surgery on his ears.
The famous offspring updated his fans on his surgery when he posted a wheel of photographs on Instagram.
In one gruesome snap, bloodied bandages could be seen wrapped around the youngster’s head.
As the photo was taken, his coronavirus face mask could be seen under his chin while he had his eyes closed.
Another photograph showed Lucas in a wheelchair while wearing his coronavirus face mask.
Recovering Lucas told fans he was “OK” following the ear surgery which he rated “10/10” at the hospital.
The rocker’s son has kept his 425k following in the loop about his surgery on social media.
He wrote: “He’s ok. Ear surgery 10/10. Fit pics 2/10.”
Many fans flooded the post sending their well wishes to Lucas while he was in hospital.
Among the fans, one wrote: “Hope all went well brother.”
Lucas’ father Mick has eight children, five grandchildren and one great-grandchild.
His eldest child, daughter Karis, 50, was a result of a fling with actress Marsha Hunt.
He has a daughter called Jade with his ex-wife Bianca Jagger and four children with Jerry Hall: Elizabeth, James, Georgia and Gabriel.