As the New England Patriots and the St. Louis Rams square off during Feb. 3's Super Bowl XXXVI, Pepsi's pop pitchwoman, Britney Spears, will be wallowing in nostalgia. The Wall Street Journal reports that during the highly rated sports event (84 million people watched last year), the soft drink giant plans to unveil a new commercial that stars Spears, 20, in a series of vignettes of old Pepsi commercials that have been strung together and re-shot to include her. The spot opens in black and white, with a sweater-clad Spears perched atop a soda fountain counter circa 1958, cooing (to the tune of the old ditty "Makin' Whoopee") that Pepsi is "for those who think young." Cut to 1963, where she's belting out "Come Alive (You're in the Pepsi Generation)" on a nightclub stage. The ad concludes with her singing the 2001 jingle, "The Joy of Pepsi." The Journal notes that the commercial was created before Sept. 11, yet conveys a subdued mood that seems appropriate for the temper of the times. Several other commercials, especially those with a satiric bent, were scrapped in the wake of the attack on America, reports the paper, which goes on to say that the Spears spot has already clicked with test audiences and ties in with the current wave of nostalgia. Familiar brands and family images are said to be scoring high among consumers.