Kelly Osbourne parties with Rod Stewart in her cat costume while Helen Flanagan channels Catherine from Wuthering Heights in her sexy look as stars celebrate Halloween

Stars were quick to get into the Halloween spirit on Saturday, with an array of costumes to celebrate the spookiest day of the year.Leading the pack was Kelly Osbourne, who confessed she was enduring a 'tired' morning still in her costume after a late night partying with Rod Stewart. Kelly was among the stars in attendance for Annabel's Halloween bash, and showed off her look that included a cat headpiece and a matching long cape.The star grabbed a selfie with music legend Rod at the event, sending her wishes to his wife Penny Lancaster who didn't attend due to illness.The next morning, Kelly confessed that she was 'tired' while sipping a tea as she played with her son Sidney.Helen Flanagan was inspired by one of literature's most famous characters, dressing up as Catherine from the book Wuthering Heights. Kelly Osbourne lead the stars getting into the Halloween spirit, as she partied with music legend Rod Stewart at an Annabel's bash Helen Flanagan was inspired by one of literature's most famous characters, dressing up as Catherine from the book Wuthering HeightsKelly was among the stars in attendance for Annabel's Halloween bash, and showed off her look that included a cat headpiece and a matching long capeNo doubt inspired by Margot Robbie's version of the character, the former Coronation Street star slipped into a low-cut lace corset with a red PVC skirt and gloves.Louise Thompson was also among the names marking the spookiest day of the year, though she marked it in New York with a night out in Williamsburg.The Made In Chelsea star revealed she'd dressed up as Cleopatra in honour of the occasion, throwing it back to her reality TV roots.Mark Wright and Olly Murs also shared a snap of their costumes, which were inspired by two of their children's favourite characters.Stars including Laura Whitmore and Leigh Francis also headed to the Hallowzeem party in Mayfair with their own fun outfits. Some stars had kicked off their Halloween celebrations 24 hours earlier, with a string of names sharing Instagram snaps of their outfits.Amanda Holden, Rochelle and Marvin Humes looked spooktacular as they led those dressing up for the spooky occasion. The JLS star and The Saturdays singer looked unrecognisable as they transformed into the iconic Nelly and Kelly Rowland.The couple left fans in stitches as they shared a video on Instagram performing their very own music video to their hit noughties song Dilemma.Rochelle channelled her inner Kelly with a plunging leather top and low-rise jeans, while sporting a wig. The next morning, Kelly confessed that she was 'tired' while sipping a tea as she played with her son Sidney No doubt inspired by Margot Robbie's version of the character, Helen slipped into a low-cut lace corset with a red PVC skirt and glovesEngland star Jordan Pickford's wife Megan got into the Christmas mood early, as she and her children dressed up as The Grinch and Whos from Who-ville The WAG showed off their fun matching outfits in snaps on Instagram Louise Thompson was also among the names marking the spookiest day of the year, though she marked it by dressing up as Cleopatra for a night out in New York Olivia and Alex Bowen took inspiration from Star Wars for their Halloween costumes by dressing up as the villain Darth Maul and Grogu The couple shared a hilarious video where Oliva was transformed into the alien Mark Wright and Olly Murs also shared a snap of their costumes, which were inspired by two of their childrens' favourite characters Rod Stewart was dressed up as Prince Charming as he attended the Annabel's party solo, while his wife Penny Lancaster was unable to attend due to illness Andy Carroll and his girlfriend Lou Teasdale were among the guests attending the Hallowzeem Party at The MAINE in Mayfair Zoe Hardman dressed up for the celebration in an edge black leather look Former Love Island star Amber Gill flashed plenty of sideboob in a revealing black dress Leigh Francis transformed into the famous He Man for the party Rochelle Humes and husband Marvin transformed into Nelly and Kelly Rowland as they led the stars dressing up for Halloween on Friday Meanwhile Amanda Holden caused a scare as axe murderer Lizzie Borden, who was tried and acquitted of the murder of her father and stepmother Lily Allen poked fun at her Auckland area tour scandal as she dressed as a poorly ticket arena Olivia Attwood and Pete Wicks nailed Harley Quinn and The Joker couples costume as they attended her star-studded Halloween bash Vernon Kay and Tess Daly's daughter Phoebe dressed as a racy devil as she posed for a fun mirror selfieMeanwhile Amanda caused a scare as axe murderer Lizzie Borden, who was tried and acquitted of the murder of her father and stepmother.The Britain's Got Talent star donned a period dress covered in fake blood while holding an axe. She was joined by her Heart Radio co-star Jamie Theakston, who was dressed as Lizzie's dad Andrew.Lily Allen poked fun at her Auckland arena tour scandal as she dressed as a poorly ticketed arena.The singer cancelled her Auckland concert earlier this year due to being sick, just nine hours before she was set to be on stage.However, fans were convinced she had pulled out of the show because she didn't sell enough tickets. Lily wore a white skinsuit with blue dots to show the amount of seating available at a concert.To show she was not very well, she darkened her eyes with make up and held a thermometer.'Never beating the allegations,' she penned on Instagram. Olivia Attwood and Pete Wicks nailed Harley Quinn and The Joker couple's costume as they attended her star-studded Halloween bash.The couple pulled out all the stops as they transformed into the DC lovers, with Pete and Olivia dressing as Jared Leto and Margot Robbie's characters.The TV personality channelled all her energy into Harley as she slipped into a metallic minidress and covered her skin in tattoos.Meanwhile, Pete, 37, dyed his signature long locks green and covered his body in white face paint.Vernon Kay and Tess Daly's daughter Phoebe dressed as a racy devil as she posed for a fun mirror selfie.