Spotlight-loving Hilaria Baldwin is flirting up a storm with hunky dance partner Gleb Savchenko on Dancing With the Stars and RadarOnline.com can reveal her jealous, old-dude hubby, Alec Baldwin , is ready to explode, fearing that his 26-years-younger wife is slipping through his fingers.

An insider said the burly 67-year-old star, who's notorious for his violent outbursts, is trying to be supportive and has faith that Hilaria, 41, wouldn't disrespect him by crossing the line with Savchenko, also 41. Article continues below advertisement

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"But there's no sugarcoating the fact that it's still his absolute worst nigh

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