By Ayaan Ali Countdown star Rachel Riley has jokingly revealed “her new boyfriend” after returning to work – and fans have been left in hysterics. The TV star and maths whizz posed next to a giant troll in a recent Instagram snap as she geared up for a new episode of 8 Out of 10 Cats Does Countdown on Channel 4. Viewers were left in fits of laughter after the prop was used to replace Rachel on the show on Friday night. The 38-year-old showed off her glamourous look with her followers as she rocked a frilly pink dress with matching heels. The post has garnered thousands of likes since it was po…