Teen pop tart Miley Cyrus spent so much time getting her new hair 'do cut and blown out ... that she forgot to wear a bra and pants under her white blazer dress thing at the Billboard Music Awards in Las Vegas last night.

The 19-year-old's low-cut jacket showed off a new side of Miley.

Lindsay Lohan's finally looking the part -- trying on some crucial Elizabeth Taylor-inspired outfits for her new movie ... and TMZ has obtained pics of the wardrobe action.

Sources close to Lindsay tell TMZ, the actress is dead set on nailing Liz Taylor in her upcoming Lifetime movie "Liz and Dick" -- so she's spending countless hours trying to pick out the PERFECT outfits for the role.

We’re told Lindsay has final say on all wardrobe decisions for the film and has been giving major input into how to perfect Liz’s looks.

As we reported, Lindsay's been obsessing over Liz trying to get into the Hollywood legend's head, studying her constantly for the last few months.

The photos were snapped earlier this week during a wardrobe fitting. The first outfit was selected to recreate a famous photo shoot from Elizabeth's teenage years. The second is based on a Valentino dress Liz once wore.

"Liz and Dick" is scheduled to start shooting next month.

Noah Wyle isn't a doctor, he just played one on TV.

Here's the 22-year-old "E.R." intern back in 1994 (left) -- and 18 years later, the 40-year-old at an event in Beverly Hills last week (right).

Nurse!

Wearing all sorts of different hats, "Vampire Diaries" hotties Matt Davis, Michael Trevino and Ian Somerhalder put their differences aside and made nice at an event in Madrid this month.

Question is ...

"What to Expect When You're Expecting" divas Jennifer Lopez and Cameron Diaz both put on their glamour faces at the film's premiere in Hollywood on Monday.

Question is ...

Here's eternally youthful supermodel Christie Brinkley, 58, at an event in Hollywood on Wednesday (left) -- and former "Heroes" star Ali Larter back when she was 33-years-old in 2009 (right).

A 25 year age difference never looked so flawless.

We're just sayin'.

Here's "Judge Judy" star Judith Sheindlin, 69, in NYC on Wednesday (left) -- and cutting edge popstar Lady Gaga in Taiwan on Wednesday as well (right).

It ain't easy being green.

We're just sayin'.

George Clooney and Steve-O's ex-girlfriend Elisabetta Canalis got on all fours while tanning her slammin' single body in a purple bikini in Cannes on Tuesday.

From the glorious looks of it, she won't be sans boyfriend for much longer.

Joey Lawrence is taking it all off ... or most of it at least ... because the 90s heartthrob just inked a deal with the man-stripper crew at Chippendales in Vegas.

A rep for the beefcake brigade tells TMZ, the 36-year-old former "Blossom" star will don the legendary bow tie ... and not much else ... for a special engagement at the Rio from June 7th-24th.

We're told Joey will sing, dance ... the "whole nine yards."

Joey's celebrity MC predecessors at the famed strip show include 98 Degrees singer Jeff Timmons and former "Bachelor" star Jake Pavelka.

It's unclear how much Lawrence is getting paid for the gig -- but in those parts, there's only one currency ... singles.

Believe it or not, but "sleazy" popstar Ke$ha put away her usual ragged outfits, torn stockings, morning-after smeared makeup and ratty weave to do her best Blake Lively impersonation by bathing and glamming it up at an event in Beverly Hills last night.

The 25-year-old looks great, now if she could only do something about her music.

Rachel Uchitel really is a mother -- she gave gave birth to a healthy baby girl Tuesday evening in San Francisco.

TMZ's learned Rachel and husband Matt Hahn welcomed their daughter -- 7lbs. 1oz. -- at 5:04PM PT.

Just a couple weeks ago, the 37-year old former Tiger Woods mistress one-upped Demi Moore's famous Vanity Fair cover by posing in a sheer sheet ... and while flashing a thong.

According to Matt's Facebook the little girl's name is Wyatt Lilly -- a real pistol. Just like Mom.