For the second time in four months, speculation is mounting that Ashlee Simpson and Pete Wentz may soon vow to stay together until death -- career or otherwise -- do they part.

The latest round of nuptial nattering comes from FOXNews.com, with a spy claiming the remodeled popster was "absolutely glowing" while showing off a "big diamond" ring at a Los Angeles soiree a couple of weeks back.

"Friends kept coming up to her and deliberately looking at the ring before hugging and congratulating her," tattles the conclusion-leaping mole. "There was definitely something very special going on."

What's more, Simpson, 23, and Wentz, 28, supposedly "couldn't keep their eyes off each other" at the party, although perhaps they were just making sure their eyeliner wasn't smudged and their flat-ironed coifs stayed perfectly straight.

"Ashlee is pretty convinced Pete is the one," a Simpson confidante reveals to FOXNews. "I am sure she is ready to move into the next stage of the relationship as soon as the time is right."

When contacted about the ring rumblings, Ashlee's spokesman told MSN Entertainment, "We do not comment on our clients' personal lives."

Back in July, however, her rep insisted to Us Weekly that rumors the Fall Out Boy bassist had popped the question before he hit the stage for Live Earth were "absolutely not true."

What's more, just before that first round of engagement whispers surfaced, Wentz assured In Touch, "No wedding bells for me in the future," although he did concede, "I have never met somebody who makes me feel the way she makes me feel."

In related news, did Ashlee's big sister Jessica have an uncomfortable Halloween encounter with Maroon 5's Adam Levine, whom she was briefly linked to in the wake of her split from Nick Lachey?

So says the New York Daily News, which claims they wound up at the same VIP shindig, a run-in that didn't sit well with Simpson.

An eyewitness alleges the starlet "sat with her assistant sulking on the couch as she watched Adam and his dominatrix[-costumed] girlfriend making out."

As for Jessica's meet-up last week with Owen Wilson in Los Angeles, at least one source is convinced there's something a-brewing, despite pooh-poohing that they're just pals.

An insider tells the Chicago Sun-Times the on-the-mend actor took a shine to the stacked blonde during Willie Nelson's Oct. 16 video shoot in Texas because she's one of the few people who hasn't acted overly concerned with how he's doing following his reported suicide attempt.

"Jessica was just cute and flirtatious and treated him like she would have before that incident," an on-set snitch tells the paper. "Owen loved that."

But have they taken their chumminess bicoastal?

Perez Hilton reports the fair-haired pair was spied "getting cozy" Saturday night at New York's Rose Bar.

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