Amanda Holden has spent the whole weekend celebrating her 51st birthday and on Sunday she was joined by good friends Simon Cowell and his fiancée Lauren Silverman.MORE: Simon Cowell's mammoth London home where he's recovering from second bike crashTaking to Instagram, the mother-of-two shared a sneak peek inside the casual celebration, which included a trip to the pub.WATCH: Amanda Holden makes surprising Simon Cowell confession"Full of Sunday roast and apple pie #Sunday #friendship #food," she captioned a picture showing her alongside Lauren and friend Kelly Hoppen, who also joined them. All three women were wearing sunglasses, no doubt enjoying the sun that shined over the weekend.RELATED: Simon Cowell forced to miss Britain's Got Talent after contracting COVID-19READ: Simon Cowell pays tribute to Nightbirde and Jamal Edwards following their sad deathsIn her Stories, Amanda shared a rare photo of Simon, 62, who could be seen smiling at the camera and looking in great shape, despite the big cast on his left arm.