Prince Harry and Meghan Markle
Prince Harry (R) and Meghan Markle (L) at the Invictus Games 2017 in Toronto, Canada Getty

Meghan Markle was spotted wandering the streets of London's upmarket Chelsea on Monday afternoon amid reports she is already engaged to Prince Harry.

The 36-year-old Suits actress went for a monochromatic look in a grey jacket styled with a big grey scarf along and a black cable knit jumper and flared jeans, finishing off the look with heeled ankle boots and a pair of tortoiseshell sunglasses to shield her makeup-free complexion. The pictures were obtained by MailOnline.

The latest sighting of Harry's girlfriend comes after she was reportedly seen at Heathrow airport.

Markle appeared to be hitting the London borough's famous shops as she walked past stores including Peter Jones, Kate Spade and Rag and Bone on Sloane Square. The area is famously Kate and Pippa Middleton's go-to zone for shopping, so Markle appears to be fitting right in.

The actress – who has been dating Harry for over 18 months – was carrying a £2,000 black Prada handbag and a shopping bag from one of the UK's most sought-after facialists, Sarah Chapman.

Markle – who appeared to be wearing no makeup at all – may have indulged in one of the British skincare expert's facials, which start from £145.

Known for her polished appearance at all times, Markle is a big fan of facials, recently claiming that she is a regular customer of Kate Somerville's.

Suits season 7
Meghan Markle stars on Suits alongside Patrick J Adams USA Network

The LA-born star invests in a great hydrating moisturiser and splashes out on regular treatments, which may be the secret to her age-defying complexion.

On what she slathers on her face, she told Beauty Banter: "Kate Somerville Quench. I've been going to Kate's clinic in LA for facials for years, and now that I live in Toronto for work, I still use the products to maintain that glow that her products give."

Markle's arrival in the UK comes as speculation is rife about an imminent engagement between her and Harry, which is becoming increasingly likely now that the Queen and Prince Philip's 70th wedding anniversary was celebrated on Monday (20 November).

meghan markle
Markle and Prince Harry are already engaged, according to one report. getty

Us Weekly alleges that the couple are already betrothed, and believe they will make their television announcement very soon.

Insiders have told the publication that the couple have begun planning their wedding and have even set a date for the ceremony.

The source told the publication that Markle and Harry will participate in an official photo shoot and television interview at Kensington Palace "sometime in January".

"It gives Meghan some to get settled and will be a great start to 2018", they added.