J-Lo and Marc Anthony's Nuptials 'Bout to Break

Here's Jennifer Lopez and Marc Anthony staging a united front while out to dinner at Luau Restaurant in Beverly Hills last night - a rare occasion for the spouses these days.

J-Lo raised eyebrows last week when she attended The Curious Case of Benjamin Button premiere sans Marc - or wedding ring.

And from what insiders tell Us Magazine, the gesture isn't to be taken lightly. 

'Nothing Jennifer does is without purpose,' one source said.  Which is to say: after four years of marriage, J-Lo and Marc's marriage mighta maxxed out. 

First off, Marc is crazy controlling, going so far as to monitor his wife's phone calls and wardrobe choices.  Yes, he's to blame for her skirts getting longer and her famous booty staying hidden. 

On top of that, he never wants to take care of the kids:

'With him, it's almost like, "Ugh, they're crying again?'

He's a convenient excuse to blame for her wrecked career:

'Jennifer looked around and said, "This is my life now? I'm a Long Island housewife?"  She hates that everything she worked for went down the tubes.'

And, finally, J-Lo's best friend can't stand Marc, who's been talkin' poo when his wifey's not around.  Us reports:

'One night after their tense family Thanksgiving in which the couple "didn't sit together," Anthony hit NYC hotspots Bungalow 8 and Marquee, where he was spotted with his hand on a woman's thigh and overheard complaining about his wife to a group of women, "telling them, 'She's making me miserable,'" a source says.

His club spree didn't stop there: The next night, he was photographed by TMZ partying sans wedding band with pal Eva Longoria Parker and Russell Crowe in Las Vegas.'

So basically, we've got two people who never wear their wedding rings, kinda hate each other, and have two newborn 10-month-old twins.  Awesome!