About 18 weeks of prep is usually required. Bring your calories up. Bring your activity up. Lift. Do HIIT. Repeat. You'll be lean and tight as a drum if you do it right.
One week away, there's nothing that can be done. In fact, to look your best for a shoot (full and with split legs) you don't want to do anything the last 10 days before the shoot.
If you're not ready, it's too late.