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Piers Morgan may consider Kate Moss a “vile little creature,” but two other mouthy Brits think she’s Absolutely Fabulous. The model, whose limited acting credits include two video shorts and one 1992 made-for-TV flick, will appear on a one-off episode of the raunchy cult classic.  Its an unexpected move for Moss, who, for such a public face, is fiercely private and rarely grants interviews—especially on camera. Joining designer pal Stella McCartney and athletes Linford Christie and Colin Jackson, Moss will reportedly make her comedic debut on a March 23 episode benefiting UK charity initiative, Sport Relief.  The charity’s particularly championed by David Walliams, whose wife Lara Stone would round out that foursome quite well.  Stone tweeted the other day that she was on set for a Sport Relief shoot, but no word on whether or not she’ll join the lineup of attractive guest stars on Ab Fab. “Kate was really excited to get involved with the show. She’s a real fan and always quotes it with her mates,” a source tells the Mirror. “When she got the script, she squealed with delight. She thinks it’s brilliant, and she likes having a giggle at her own expense.”