Notoriously private actress Sienna Miller appears to have bowed down to pressure with the rest of the A-list elite by joining Instagram.

Last night, the 35-year-old British actress signaled her first step into the social media sphere with a black-and-white photograph of herself.

In the photograph, Sienna can be seen wearing the Dior 2017 runway hit, 'We Should All Be Feminists' slogan T-shirt, and holding up her hands - her fingers displayed in a Star Trek-inspired wave – with the word 'greetings' written across her palms.

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She captioned the snap: 'Hello World Wide Web #givin #peerpressure #luddite.'

Over night, the mother-of-one – who's Instagram profile description now reads 'Marlowe's mama' but is yet to be verified with a blue tick – amassed over 5,580 followers, with the star following the likes of Barrack and Michelle Obama, Bernie Sanders, former co-star Ben Affleck and British model sisters Cara and Poppy Delevingne.

Sienna Miller | ELLE UKpinterest
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And while we're excited to see the Alfie actress is also following ex Jude Law's former wife Sadie Frost and his two eldest children Rafferty Law and Iris Law, we must admit, we're already giddy thinking of the candid snaps of Miller's enviable wardrobe, golden hair, make-up tutorials and photographs of her avocado kale smoothies and pub nights out with her friends Matthews Williamson, Keira Knightley and ex Tom Sturridge.

Sienna Miller in NYC | ELLE UKpinterest
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*Follows and awaits second post*