Question regarding S/S image

[ryuugazaki.livejournal.com]

Since the community consists of an immense gathering of CLAMP fans, I figured this would be best asked here without going against any rules :)

I was wondering if anyone could tell me exactly where this image of CCS-universe Sakura/Syaoran appeared in terms of print (Unless it was originally in digital format only):

( Behind the cut )

I keep feeling as if I actually own a piece of merchandise that includes this drawing (Although I don't believe it is found in any of the illustration artbooks...or was it a furoku of some sort?), but it has been a long while since I revisited the series, so I'm definitely suffering from the inability to place this image's origin! Thank you in advance for anyone who has the answer :)