Watching Mad Men the other night, I was struck by how glamorous all the women look ... in bed! They may be a bunch of dysfunctional basket-cases, but none of those ladies -- not even Peggy! -- would be caught dead in some of the scroungy things I sleep in -- from old T-shirts to stretched-out camisoles. Yikes!

So, time for some nighttime spring cleaning, I say! Out with the old, in with the sexy. Are you with me? (I bet your mate is!) To get inspired, here's round-up of nightwear that's sexy but comfortable enough that you can actually sleep in it. Plus you won't feel totally mortified if your kids catch you wearing it!

There are certain models you can just tell were always destined for stardom beyond the runway or pages of magazines. Think Christie Brinkley, Cindy Crawford, Kate Moss, Miranda Kerr, etc. As soon as Kate Upton burst onto the scene as the Sports Illustrated cover girl, it was clear she was bound to follow in those supermodels' footsteps and go well beyond the fashion world. Now, she's confirming that in the June issue of Vogue -- the cover on which she's called the "hottest supermodel on earth."

By the way, while she's been on the covers of Vogue UK and Vogue Italia, this is the first time she's featured the cover of the U.S. publication. Score. And it's an accomplishment that seems to be just one of the first steps in her master plan for domination of both entertainment and fashion worlds.

Ugh. Bras. We can't live without 'em, but to say finding one that fits well, lifts and separates the way it's supposed to, and makes us look amazing in our clothes seems like an impossible feat, to say the least.

But as it turns out, a lot of us are making bra shopping way more difficult than it has to be. (Everything is our fault. Face it.)

Last week, I had the pleasure of chatting with Jené Luciani, style expert and author of The Bra Book -- and she gave me some easy tips for how to find the perfect bras -- and how to care for them properly so we remain happy with them.

OMG, you guys -- so many of us are making major bra mistakes. (I definitely am.)

Ooh-la-la! Queen Elizabeth should probably cover her ears so she doesn't hear about this -- Kate Middleton received pregnancy lingerie as a gift, and she's reportedly "delighted" with her new unmentionables. (Gasp!)

Designer Lorna Drew, of Lorna Drew Nursing Lingerie, sent Kate an ivory satin Alexa bra and brief, and also an Amy bra and brief in a rose pattern. Both are from her latest collection, and she had a good reason for why she thought the Duchess of Cambridge needed to add a little flavor to her undergarments.

Rosie Huntington-Whiteley must have heard about the scientist who declared bras to be bad for your boobs! The Victoria's Secret model was snapped sporting a very revealing, sleeveless top and most definitely NO Wonder Bra. The question is: did she look in the mirror before heading out on the street?

Apparently Rosie was leaving a swanky Beverly Hills hair salon when the shots were snapped. Her hair does look awesome, as per usual, but perhaps it was a bit, er, NIPpy in Southern California the other day? The Daily Mail sagely notes that it's not as if she needs a bra. Indeed, but more to the point, after carefully scrutinizing all of the shots of Rosie in her perky glory, I have come to the conclusion that ...

I knew it! French scientists have spent 15 YEARS researching bras only to find out what I could have told them in 30 seconds: bras deserve to be burned.

Not only do they not help ease back pain (um, duh), but the study reveals that bras might actually contribute to sagging. Of course, this doesn't mean I'll stop wearing my bra any time soon.

According to the researchers, bras are nothing more than a "false necessity" -- but I'm not so sure about that.

Sometimes we get in a rut of wearing the same old underwear over and over. You know the ones I'm talking about. The comfy, cotton ones that never ride up even though the elastic is giving out a little. Yeah, those. They aren't sexy. They may as well be birth control. They don't make you feel sexy either. Which is why every now and then we need to treat ourselves to some naughty little underthings. They don't have to be edible or crotchless, though if you're into that sort of thing go for it! But they do have to put you in the mood just by putting them on. Maybe they are frilly, sheer, or lacy. And maybe, most likely, your sex life might get a little hotter just from wearing some lingerie because you'll want to show them off to your lover.

Here are 5 sexy but simple lingerie ideas that are so irresistible they may make your sex life that much hotter.

UPDATE 4/11: Victoria's Secret president and chief marketing officer Ed Razek has denied that Miranda Kerr will part ways with the brand. "Kerr is one of the best models in the history of the business - and easily one of the most popular. She is also a consummate professional. Any rumors to the contrary are simply untrue." Meanwhile, sources tell Kerr is stepping down because she could not devote enough time to the demanding brand.

You'd think Miranda Kerr would have the kind of star power Victoria's Secret would be grateful to have in their arsenal. But no. The lingerie brand is clipping the 30-year-old Angel's wings and letting her go after her $1 million, three-year contract "was not renewed," according to industry insiders. AKA she's being fired! What the heck? Totally did not see that one coming.