The Crown starlet, 25, was hard to miss in an oversized lilac tracksuit, wearing the hood up over her blonde hair.
The outing comes a week after Emma changed her pronouns to she/they on her Instagram bio – meaning she is happy to be addressed by either.
Stroll: Emma Corrin was pictured holding hands with a mystery companion in leafy London on Monday
Emma and her companion went to a local shop and picked up items before heading home.
The actress was seen out in east London last Tuesday during a break from rehearsing for her upcoming play Anna X, where she chatted on the phone in the wake of the change to her online presence which came to light the previous day.
Eagle-eyed fans noticed the amendment as Emma also shared a series of stunning black and white images of herself wearing a make-shift breast binder using box-tape during a previous photoshoot by David-Simon Dayan.
Close: The Crown starlet, 25, was hard to miss in an oversized lilac tracksuit, wearing the hood up over her blonde mane
Chat: She wore minimal make-up and white trainers, walking hand-in-hand with her handsome companion
Supplies: The pair went to a local shop and picked up items before heading home
In the earlier social media updates, Emma shared her ‘intimate’ journey with buying her first breast binder with her Instagram followers on Monday afternoon.
Revealing the snaps were taken before she bought her first binder, Emma said: ‘Some time before I bought my first binder, messing around with @sirdavidsimon.
Emma went on to reveal she is on a ‘journey’ with lots of twists and turns, but admitted that she was ’embracing it’.
Candid: Emma changed her pronouns to she/they on Instagram and shared her ‘ journey with buying her first breast binder on Monday after taking part in a photoshoot
Pronouns: Eagle-eyed fans noticed the change in pronoun on Emma’s bio
She wrote: ‘We used boxing wrap, thanks for capturing this with me, very intimate, very new, very cool. It’s all a journey right. Lots of twists and turns and change and that’s ok! Embrace it.’
Breast binding, also known as chest binding, is the act of flattening breasts by the use of constrictive materials. The term also refers to the material used in this act.
Emma also revealed the type of binder she uses, which is by LBGT and trans owned brand gc2b.
The star’s post received a wealth of support from her followers.
Many left heart emojis in the comments section, while singer Paloma Faith, wrote: ‘Beautiful pictures’.
Post: Revealing the snaps were taken before she bought her first binder, Emma said: ‘Some time before I bought my first binder, messing around with @sirdavidsimon’
Making a statement: The Crown actress (pictured in the Netflix show) shared a picture of herself in a wedding gown that she captioned, ‘ur fave queer bride’
Love: The star’s post received a wealth of support from her followers
In June, Emma marked the end of pride month by sporting a rainbow jumper while out and about in London. Months earlier in April, Emma appeared to announce that she is ‘queer’.
She took to Instagram as she shared a picture from a spread in Pop magazine where she was clad in a wedding dress and veil.
She simply captioned the image: ‘ur fave queer bride’.
Emma has most recently will stared in LGBTQ+ drama My Policeman alongside Harry Styles, which wrapped filming last month.
Emma has kept tight-lipped on any talk surrounding her sexuality and dating life.
Back in October, she was asked by Stella magazine if there was a ‘boyfriend on the scene’, and replied: ‘I’d rather navigate this on my own. It’s nicer to feel like I’m taking care of me.’
Homage: Emma was pictured wearing a rainbow jumper to mark the end of Pride month when she was pictured with her female photographer friend Elise Limon on July 2
MailOnline has contacted Emma’s representatives for comment.
Emma soared into the spotlight last year with her breakout role as Princess Diana in Netflix’s The Crown.
The British star plays the late Royal in the fourth series of the drama, in a role which has won her widespread critical acclaim.
Speaking out: Emma appeared to announce that she is queer in an Instagram post in April
The Crown star Emma Corrin steps out in a purple tracksuit as she holds hands with a mystery man