A petite blonde woman sits spellbound in the Dancing with the Stars studio audience as the couples make their entrances.

Last season, Marriann Nelson screamed herself hoarse cheering for her daughter, the sensational young ballroom pro Julianne Hough.

"This season," she tells TV Guide, "I thought, 'I'll be calm.' But when they both came out â€" my daughter on one side and my son on the other â€" I just lost it."

Mom isn't the only one wild about Julianne and her equally talented big brother, Derek.

Julianne danced her way into the winner's circle last season with Olympic speed skater Apolo Anton Ohno and poses a serious threat once again with her new partner, two-time Indy 500 winner Helio Castroneves.

Meanwhile, newcomer Derek has shown remarkable grace under pressure by regaining his footing with Beverly Hills, 90210 star Jennie Garth after the two slipped and fell at the end of the second week's performance.

"It's good when things like that happen sometimes," he says, "just to remind people that this is real, this is live."

If these two show unusual maturity for such young performers, it's because they've been rehearsing all their lives.

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