Blanket 'Bigi' Jackson has finally joined his siblings in the 'legal adult' club and sister Paris Jackson could not be more shocked.

The 21-year-old Chanel model took to social media to share several throwback photos of her sibling.

'I used to change his diapers. This is such a trip,' reflected Paris . 'My brother is a legal adult today. what the f*ck,' marveled Paris.

The first photo in her nostalgic Instagram slideshow featured herself standing next to Blanket and her eldest brother Prince, 22, in a movie theater.

They are joined by an unknown pal.

She continued: '[I am] proud of the handsome, intelligent, insightful, funny, and kind young man [Blanket] has become.'

He likes privacy that's all I gotta say. hbd lil bro,' concluded the proud big sister.

Another picture shared by Paris shows a much younger brother-sister duo rocking some silly facial expressions.

The final snapshot was of a teenage Paris beaming down upon Blanket, who changed his name to Bigi in 2017, while playfully grasping onto his cheeks.

Blanket - born Prince Michael Jackson II - was first introduced to the world when his late father Michael Jackson held him over a hotel balcony railing while staying in Berlin in 2002.'