The tabloids are doing their best to nudge Ryan Reynolds into locking down Scarlett Johansson.

Just weeks after rumors surfaced that an engagement announcement was imminent, the hypermammiferous starlet, 23, was spied wading through a sea of silk and tulle while checking out bridal gowns at the Monique Lhuillier boutique in Los Angeles with her mom and sister, reports the New York Post.

"They stayed for a while," a source tells the paper.

But it looks like Scarlett and Ryan, 31, who previously popped the question to Alanis Morissette, aren't quite ready to commit to each other until one of them drops dead.

"A family member is getting married, not her," her rep pooh-poohs to Us. "She is not engaged."

But that doesn't mean Johansson is averse to commitment. She tells the March issue of W magazine that she's looking forward to marriage and kids, and she expresses her frustration over how the press has unfairly made her out to be some sort of "harlot."

"I've been battered for saying that I don't believe humans are monogamous by nature," sighs ScarJo of her much-dissected remarks from a couple years back. "The response was, like, 'What a ho-bag!' I didn't mean that I don't practice monogamy in my own life -- of course I do! I'm not going to be in some tarty relationship. But I stick by what I said."

She also stands by her previous admission about how diligent she is when it comes to practicing safe sex.

"I said I get tested for AIDS twice a year, and again that got spun as me being promiscuous," fumes the actress, who calls the tabloids "hideous and the downfall of society." "But I was single at the time, and I think it's important to do that!"

Scarlett and Natalie on the "Today" show on Feb. 12

Meanwhile, Natalie Portman, who co-stars with Johansson in the upcoming "The Other Boleyn Girl" and strikes a vampy, dominatrix-inspired pose with her on the cover of the magazine, isn't quite as sold on the idea of love as a legally binding contract.

"I'm into monogamy," explains Nat, who has been keeping company with comely designer Nathan Bogle. "But I'm not really into marriage right now. I sort of hate the legal aspect of it. What does the state have to do with it? Why are they making rules that say my lover can stay in the United States if they're foreign or share my health care benefits because I'm straight but if you're gay, you can't have that?"

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