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Brad Pitt, John Travolta, Justin Bieber, Dianna Agron

Fame Pictures; ANG/Fame Pictures, Humberto Carreno/startraksphoto.com; Flynet

OK. Technically, Justin Bieber is serving up a peace sign in that pic above and not a wave.

But it's a warm, friendly gesture, nonetheless, and one of the many times this week that celebs were kind enough to take the time to acknowledge their fans.

In addition to the teen sensation greeting Beliebers outside the Late Show in NYC, Dianna Agron got Gleeks giddy in Manchester, England, John Travolta showed Parisians a little love and Brad Pitt handsomely motioned to folks in Malta.

Meanwhile, many other celebs provided us with memorable moments over the course of the last seven days, as several of our photo galleries prove...