Should we start worrying yet? I don’t know. Rumer‘s kind of been on the slinky side for quite some time now, but as of late, she looks like she’s lost more than just a few pounds here and there. Could it be the stress of her mother’s situation trickling down? Could be. Could it be a sickness that was sort of ingrained as she grew, considering who she was raised by? Could also be. But she’s definitely looking significantly different, and I’m not quite sure it’s just the whole ‘growing up’ and ‘losing baby fat’ thing.

Interestingly enough, though, Rumer was photographed hanging out with Ashton Kutcher last night at a club in LA, where she sang for the crowd. Ashton was said to be in the audience, cheering her on, and what do we make of that, folks? From People:

The starlet had the support of her mom’s ex husband during her four-song performance Tuesday at Hollywood’s Sayers Club Sessions Presented by Jason Scoppa. (Moore, who recently returned to Los Angeles after treatment did not attend – nor did dad Bruce Willis.)

Rumer, who recently showed off her vocal prowess at the club, didn’t seem nervous at all before her performance, according to an onlooker, and she greeted Kutcher as he arrived with a friend after midnight.

According to the onlooker, the Two and a Half Men star attempted to keep a low profile, letting Willis, who recently premiered The Diary of Preston Plummer in Miami, bask in the spotlight instead.

And as soon as Rumer, 23, took the stage, Ashton looked on proudly and snapped some photos on his phone.

As for her set, Willis tackled Ann Peebles’s soul staple “I Can’t Stand the Rain;”"High Low Middle” by indie chamber pop outfit My Brightest Diamond; Otis Redding’s “(Sittin’ On) The Dock of the Bay”; and British soul singer Lianne La Havas’s “Age.”

As her performance continued, the crowd got more into it, clapping along and encouraging her. Kutcher whistled at one point and even sang along to some of the lyrics.

After the show, Willis talked to a few people before sharing a long, emotional embrace with Kutcher.

Says the onlooker: “It seemed really happy and loving – and like the two would be friendly … no matter what.”

I think the only thing we should maybe concern ourselves with is the fact that girlfriend her is still (closely) palling around with Ashton Kutcher. You know, her mother’s soon-to-be ex-husband that cheated on her? I know that Ashton was like a father figure or whatever for a long period of time, and they probably have a closer relationship than we all might think, but man. Talk about a weird dynamic right there. How is Demi OK with her daughter still being friends with Ashton, and how is Rumer OK with maybe slighting her mom by keeping ties open with the dude that helped send her off the edge?

I mean, OK, the answer is probably no. No, Zac Efron is probably not dating Rumer Willis. But that won’t stop the tabloids from wondering!

Pop2it has assembled this helpful list of places the are-they-or-aren’t-they pair has been spotted together:

- Zac accompanied Rumer (and the Willis family, sans Demi) on an ISLAND ADVENTURE in December 2010

- In July, Rumer, Zac, and friends watched helplessly as pal Ryan Rottman was arrested for a DUI (nice “Stay Reckless” T-shirt, cargo-shorts guy)

- Also in July: In Touch reported that Zac finally met Demi and “brought [her] flowers”

- Last month, Zac and Rumer went clubbing with the aforementioned Ryan Rottman, but Zac left before Rumer did (I sure hope they all took cabs)

- They’ve been hanging out this month, too

Let me just also add that Rumer was rocking a bandage dress way back in 2008.

The truth? The truth is, I want this to be true so hard. Wouldn’t that be the best ever?

(Image via CercaIN.)

Did you know that Rumer here is going to be a big sister? Yeah, I know she already is, but as it turns out, her daddy is having another baby with his young wife, Emma Heming (and yes, I too am wondering if this child will have the Willis chin, much like his other girls do).

I know a lot of people never really have a whole lot of good to say about Rumer, but I’ve always liked her best of all the Willis girls. I think she’s edgy, has style, and is probably the prettiest of the bunch. Even if she does have a really stupid Megan Fox-Scarlett Johansson tattoo on the inside of her forearm (seriously, what the hell is that?).

How do we feel about girlfriend’s look?

[Images removed by request]

Boy these Willis girls have unforgettable looks. Seriously. And before y’all go flying off the handle, let it be known that I actually think the Willis girls are beautiful. No one looks like them.

And in related news – better late than never, I guess – did you guys know that Rumer Willis is doing a singing thing? She actually sounds good. Here, listen (Rumer isn’t featured ’til around the minute-thirty mark):

The single’s supposed to drop sometime this month.

Anyway, here’s these two shopping at Whole Foods. I think if I had to pick some people that I’d want to hang out with in Hollywood, Rumer might make the list. And NOT because, you know, I’d be lurking in her step-daddy‘s bathroom during a party in hopes to catch a glimpse of his wang or anything. She just seems cool.

I used the word “streetwalker” in the title, because can you imagine if I’d just called Rumer Willis a hooker right there in the headline?! So catty!

But for real, this is what Rumer wore to go shopping in, and it’s ridiculous. I mean, I’m sure it’s sweltering in California right now, but this isn’t “I’m not wearing a lot because it’s 100 degrees outside,” this is “I’m not wearing a lot because I want to get laid. By a stranger. Who will pay a fee.” And that’s a little different.

Then again, maybe this silly outfit is perfectly acceptable. Maybe those awful shoes are all the rage, and maybe it’s totally cool to wear shorts that, at certain angles, have just got to showcase your vagina. I don’t know, I don’t get out much.

So what will it be, friends? Are we loving or leaving Rumer today?

Now, I’ll be honest with you — I don’t know why Rumer Willis gets so much flak for looking the way she does. I actually think she’s quite attractive, albeit in an unconventional way. Yeah, she’s got a big chin, but so does Jay Leno (and Lordy, his is much, much bigger). He’s still got fans and probably admirers, too, right?

Exactly.

But whatever — what do you think of the outfit? Is it flattering her figure, or should it have stayed in the closet? I hate the shoes (gladiator sandals should just be killed until they die from it), but the rest of the outfit? Looking good, Rumer.