Chelsy parties with pals: Prince Harry's stylish ex turns heads at society bash (but is nearly upstaged by Mary Charteris and her bizarre cloak)

• Chelsy Davy, 29, was at the launch of the Relay Building in Aldgate
• Looked glamorous in navy blue dress and towering tan wedges
• Was joined by old friend, DJ Jacobi Anstruther-Gough-Calthorpe, 32
• Mr Calthorpe is the older half-brother of Cressida Bonas, 26
• Also there was Lady Mary Charteris who arrived wearing a cloak 

By Ruth Styles for MailOnline

Published: 05:17 EST, 11 June 2015 | Updated: 10:07 EST, 11 June 2015

She might be the bookies' favourite to one day marry Prince Harry but Chelsy Davy didn't appear to be missing him as she partied in London on Tuesday night.

The Zimbabwe-born lawyer, 29, turned heads in loose-fitting navy blue and sky-high wedges as she arrived for the launch of the Relay Building, a luxury office space in East London's Aldgate.

Glamorous though Miss Davy looked, she was almost upstaged on the night by Lady Mary Charteris who turned up to the event sporting a bizarre Batman style cloak. 

Party pals: Chelsy Davy and Jacobi Anstruther-Gough-Calthorpe strike a pose behind the decks

Joining the pair was old friend Jacobi Anstruther-Gough-Calthorpe, the 32-year-old brother of Sam Branson's wife Isabella and half-brother to another royal ex, Cressida Bonas.

Mr Calthorpe, a businessman who moonlights as a DJ for musical collective Housekeeping, was there to support Taylor McWilliams.

Texan Mr McWilliams is also part of Housekeeping but when not playing music, runs Hondo Enterprises - the company behind the new building.

Many of the guests, among them Lady Mary and Mr Calthorpe, took to the decks while others, such as Steve Lazarides, the gallery owner who doubles as Banksy's agent, milled around quaffing champagne. 

Bizarre: While Chelsy (right) looked great in her navy dress, Lady Mary Charteris chose an eccentric get-up

Close: Jacobi and Chelsy have been friends for years and move in similar circles

Guests: Host Taylor McWilliams (left next to Chelsy) also invited Lady Mary's husband Robbie Furze (right)

While Miss Davy did join Mr Calthorpe behind the decks, the pair, although both newly single, are not romantically involved and are old friends. 

Most recently, they were seen partying together at the Cash & Rocket charity fundraiser at London's Dorchester Hotel in May and often holiday as a pair.

Like Miss Davy, Mr Calthorpe is also thought to have received an invitation to Princess Eugenie's upcoming 25th birthday bash at Windsor Castle.

The party, which has been billed as a 'posh rave', will see a bevy of society names as well as a smattering of celebrities descend on the 900-year-old castle for the night.

Other names reportedly on the guest list include models Cara Delevigne and Naomi Campbell and hellraiser Kate Moss, who was thrown off an easyJet flight on Sunday due to 'disruptive' behaviour and swigging from a bottle of vodka.

At Luton, the 41-year-old was escorted off the plane by Bedfordshire police, calling the pilot a 'basic b***h (unoriginal or boring) as she went. 

High flying: Actor Will Stoppard attended with his glamorous violinist wife Linzi (left). Right: Host Mr McWilliams pictued with Banksy's agent and art gallery owner Steve Lazarides

Music fans: Businessman Jacobi is also part of DJ collective Housekeeping. Lady Mary also DJ's

Heading home: Lady Mary makes her exit accompanied by Mr Furze - one half of electro duo Big Pink

Chelsy Davy relaxed with the Royals at a sporting event (archive)