Thats no Moon, Thats a space station!
I had this happen on my drivers side recently. Best option is to buy the CV boot repair kit either from Audi or TPS its about £40 and comes with all the bits needed to do the job eg hub bolt and the grease too.
I didn't fancy doing the job myself so got a local independent garage to fit it for me for about an hour and half labour charge.
Make sure you get it done sooner rather than later as you don't want the joint drying out as then you may need to replace some expensive bits.
Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator, N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch