February 17, 2007 06:00 AM

Christina Aguilera kicks off her new tour in Houston in fine form – and with a flock of Roberto Cavalli-designed costumes in tow – on Tuesday. PEOPLE takes a look at what to expect from Ms. Ain’t No Other Man, plus other events to watch for in the coming week:

SUNDAY, FEB. 18: You can bet the competitive spirit will be fierce when former Amazing Race contestants including Survivor stars Rob Mariano and Amber Brkich (who now goes by her married name), cousins Charla Faddoul and Mirna Hindoyan and last season’s love-to-hate-’em beauty queens Dustin Seltzer and Kandice Pelletier go head-to-head for the $1 million prize in the premiere of The Amazing Race: All-Stars (8 p.m. ET). They’ll make pit stops in Argentina, Mozambique and Chile – and on the travel itinerary will definitely be some serious back-stabbing.

TUESDAY, FEB. 20: After a smoldering Grammy performance – and a Grammy win (for best female pop vocal performance) – Christina Aguilera is all geared up for her Back to Basics tour, which starts its North American leg in Houston and runs through May 5. Apart from her new, retro-sounding single “Candyman,” Aguilera has plenty of musical and visual surprises up her finely tailored sleeve. For starters, designer Robert Cavalli created 10 one-of-a-kind looks for the tour – all with a vintage flare to match her love of old-timey sounds. Plus, Aguilera has padded her bill with two opening acts – the Pussycat Dolls and Diddy‘s group Danity Kane.

The auditions are over and Hollywood week has passed. Now American Idol has whittled down thousands of aspiring singers to only 24 finalists. On Tuesday’s episode (FOX, 8 p.m. ET), the male contestants – including some familiar faces like the memorable (both because of his voice and his name!) Jason "Sundance" Head and Brandon Rogers, who sang back up for Christina Aguilera, will begin competing against each other. Then, the following night, the female contestants will have their shot. Look out for Lakisha Jones and her powerhouse voice. And for ongoing updates on American Idol, visit PEOPLE’s full Idol coverage.

THURSDAY, FEB. 22: Cue the sad music – The O.C. is ending its four year-run with a big series finale (FOX, 9 p.m. ET). Expect plenty of drama after a major earthquake struck earlier in the season. So, what does the major destruction bode for the lives of everyone in Newport? It’s a safe bet that there will be plenty of emotional wreckage. Just flash back to last season’s finale where Mischa Barton‘s character Marissa Cooper died in a fatal car crash. As the characters have made peace with her loss, maybe the series finale will strike a conciliatory tone. Can everyone heal before the show ends? Tune in to find out for yourself.

Movies (now in theaters): Ghost Rider, starring Nicolas Cage, Eva Mendes and Sam Elliott; Bridge to Terabithia, starring Zooey Deschanel; Breach, starring Chris Cooper, Ryan Phillippe and Laura Linney; Daddy’s Little Girls, starring Gabrielle Union
Music (in stores Tuesday): Erasure, On the Road to Nashville; k-os, Atlantis: Hymns for Disco; Little Feat, Rocky Mountain Jam
DVDs (in stores Tuesday): Babel; The Prestige; Open Season; Dixie Chicks – Shut Up & Sing; Flushed Away; For Your Consideration; Family Ties – the Complete First Season

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