Pop stars learned how to clone themselves before scientists duplicated Dolly the sheep's DNA in 1996 — see ex-Beatle Paul's Reagan-era breakthrough video. Then came the four Alanises singing along to ''Ironic'' and the catfighting Mariahs in ''Heartbreaker.'' Below, more-recent ''me, myself, and I'' clips — plus Sir Paul's classic.

''Just Fine'' Mary J. Blige
In the debut clip for Blige's December CD Growing Pains, a trio of Marys sing side by side like postmillennial Supremes, extolling the virtues of self-esteem — and, apparently, a superversatile hairdresser. Groundbreaking CGI it ain't, but all three MJBs look fabulous. B+

''Big Things Poppin' (Do It)'' T.I.
Before his recent arrest on weapons charges, the Atlanta rapper was busy flip-flopping between his two personae: T.I. and T.I.P. Here, the pair trade off snarky barbs and tour-bus push-ups — nothing like combining cut-downs and cardio! B+

''Better'' Regina Spektor
The quirky folkie who dazzled YouTubers earlier this year with the colorful clip for ''Fidelity'' reemerges in this Regina-by-the-dozen caper, in which the singer frolics among her doppelgä®§ers on a sunny hilltop and also sings in triumvirate. Quite the Spekt-acle. A-

''Coming Up'' Paul McCartney
Macca went multi in this clip from his 1980 solo disc, McCartney II, perhaps pioneering the use of many-me's in music videos. While he plays some 10 versions of himself (bearded drummer, Buddy Holly-esque guitarist...), wife Linda doubles in mustachioed drag. McKooky! A


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