Ciara 's no stranger to sharing sexy snapshots on social media, and they're something of an issue for us ... because we just can't leave 'em alone! And since the singer's hitting the big 4-0 this weekend, we thought we'd celebrate her special day by putting together a gallery of her most sizzling shots from over the past few years! And hey, we know Halloween's right around the corner and all ... we've got plenty of treats for you right here! Kim Kardashian 's embracing her inner influencer for