The son also rises

Tyler X. Chang, the baby son of Ch. 2’s Ti-Hua Chang, was chosen recently as the national storefront model for Baby Gap and Kid Gap stores – including the store in Times Square. Dad Ti-Hua also corralled an Edward R. Murrow Award and AAJA Civil Rights Award for his Ch. 2 reporting.

Over at Ch. 7, Lori Stokes will emcee the Food Allergy Initiative’s spring lunch, Tuesday at Cipriani, while weatherman Sam Champion and Lee Goldberg host “Be a Part of Your Park,” airing tomorrow (7:30 p.m.) as part of the 25th anniversary of the Central Park Conservancy.

And congrats to “Weekend GMA” weathergal Marysol Castro and husband Frank Donaldson on the arrival of Liam Castro Donaldson.

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Viola Davis (“Syriana”) guest-stars on “Without a Trace” for a May sweeps episode as the mother of a missing boy being tracked down by Jack Malone (Anthony LaPaglia). Nothing unusual there, except that LaPaglia and Davis

(right) also co-star in “The Architect,” premiering May 2 at the Tribeca Film Festival. In the movie, LaPaglia plays an architect confronted by an activist (Davis) trying to get a housing project razed.

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Youtube.com will exclusively screen the first five minutes of “Lucky Number Slevin,” currently in theaters, today beginning at noon (9 a.m. in L.A.) and running through tomorrow. The thriller stars Bruce Willis, Lucy Liu, Morgan Freeman, Ben Kingsley and Stanley Tucci.

Last, but not least:

* Post Middle East correspondent Uri Dan featured in “Lion in the Desert,” a special on Ariel Sharon airing Sunday on Fox News Channel (10 p.m.).

* Hoops: Ch. 9 airing first-round Nets-Indiana games starting Sunday (1 p.m.) in conjunction with YES.

* Congrats to Jill Hudson and Dan Bell, who tie the knot tomorrow in Pasadena. Jill is manager of publicity for Fox Broadcasting; Dan is VP communications, Fox Sports.

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* Now THAT’S a big TV – Panasonic has introduced what it claims to be the world’s biggest TV, a 103-inch, flat-screen plasma set that will hit the electronics market in December. Price unknown at this point.

* Billy Joel (right) is getting his very own customized chopper courtesy of the Teutuls – better known as the stars of Discovery’s “American Chopper.” They’ll build an Indian Bobber chopper for The Piano Man, who collects vintage bikes.