An Algerian teenager who threatened to decapitate TV host Aled Jones and tried to steal Bridgerton actress Genevieve Chenneour's mobile phone has admitted to machete robberies.Zacariah Boulares was 16 when he ambushed Songs Of Praise star Jones in Chiswick High Road, west London, in 2023 - threatening to cut off his head after snatching his £17,000 Daytona Rolex watch.He is serving a 22-month prison sentence for an incident in February last year when he tried to steal Chenneour's mobile phone at a branch of Joe & The Juice on Kensington High Street.Boulares has now admitted arming himself with a machete for two robberies in August 2023, when he targeted victims for their Rolex watches.He robbed Mark Turner in Kensington Square Gardens, west London, on August 9 2023.He struck again ten days later in a failed bid to steal a Rolex watch from Neil Tallantire outside Waitrose in Porchester Road, Bayswater, west London.It was six weeks later that Boulares went on to target singer and presenter Jones, who first came to fame in the 1980s singing Walking In The Air.On Friday at Southwark Crown Court, Judge Alexander Milne KC adjourned the cases for a psychological assessment of Boulares and a probation report on 'dangerousness' to be finalised for the sentencing hearing. Pictured is the moment Zacariah Boulares was arrested by Metropolitan Police officers Boulares is serving a 22-month jail term after an incident in February last year when he tried to steal a phone from actress Genevieve Chenneour (pictured) in Kensington, west LondonBoulares, now 19, appeared in the dock to plead guilty to the robbery of Mr Turner - having admitted the attempted robbery against Mr Tallantire at an earlier hearing.He also pleaded guilty to possession of a machete during both incidents.Boulares was jailed at Isleworth Crown Court in July last year for a series of crimes including the attempt to steal Chenneour's phone and a theft from a blind woman.Judge Martin Edmunds KC, the Recorder of Kensington and Chelsea, told a sentencing hearing how Boulares had targeted wealthy areas for 'rich pickings'.The judge described the defendant's approach as a 'systematic pattern of stealing from people as they are enjoying a meal or refreshment at a restaurant'.Mr Edmunds told Boulares: 'You seem to be plagued by an attitude that if people can afford nice things, then you can take them.'It's clear you are completely willing to use violence when challenged, and it's a matter of the deepest regret that individuals have been left feeling they don't want to come to London or they should leave London.'The court heard Boulares has already accumulated 12 convictions for 28 offences, including violence, threatening behaviour, weapon possession and theft. Boulares has admitted arming himself with a machete for two robberies in August 2023, when he targeted victims for their Rolex watches Pictured is the moment Boulares was caught red-handed trying to steal Bridgerton actress Genevieve Chenneour's mobile phone on Kensington High StreetChenneour had been waiting for her order at Joe & The Juice when Boulares came up behind her and reached out to grab her iPhone 14 from the side.CCTV captured the moment he was confronted and wrestled to the ground.He later admitted the crime and the theft of a blind woman's handbag at Five Guys in Thurloe Street, Kensington.He also pleaded guilty to stealing another woman's rucksack as she dined at Pizza Pilgrims on Kingly Street, near Carnaby Street in central London, in January and February 2025.The attack on Jones happened when Boulares was too young to be publicly identified.The teenager had trailed the TV star along the road and pulled out a machete, shouting: 'Give me your Rolex or I will cut your arm off.'After the robbery, Boulares noticed Jones was following him from a distance and told the TV personality to 'walk the other way or I will cut your head off'.Boulares was sentenced to a 24-month youth detention and training order, having also admitted stealing a £20,000 Rolex from a man in his seventies at Paddington station in west London in May 2023. Genevieve Chenneour is seen at the Variety Welcome to Cannes Party in May this yearSinger and TV presenter Aled Jones was among Boulares' intended targets - suffering threats of a machete attack in autumn 2023Boulares, from Feltham in south London, is due to appear in court again next Tuesday, August 11, when a sentencing date will be set.Chenneour has previously spoken of the terrifying moment she fought off the teenage thug who set upon her while she was walking her dog.The actress, who appeared in season three of the Netflix hit show as rumour-monger Clara Livingston, told the Mail on Sunday in May last year: 'They didn't expect me to stand up for myself – but I did.'Yorkshire-born Chenneour added: 'I was left with a concussion just before the Screen Actors Guild Awards and since then, I've felt constantly on edge.'Even my dog was traumatised - now, if anyone touches me, he panics and tries to protect me.'Getting a coffee shouldn't be something you need your wits about you for.'I'm so grateful to the staff at Joe & The Juice – they were incredible during the incident and when I went back to see them after.'She is a former athlete who joined Team GB's artistic swimming team at the age of 15.She was awarded an Olympic scholarship before the 2016 Games in Rio de Janeiro, but her sporting career was cut short by injury and she retrained as an actress.After being a stunt double in the underwater sequences of period feature Gateway To The West, she landed her breakthrough role in Regency drama Bridgerton.