Is there trouble in paradise for these newlyweds, already?

Nick Lachey and Vanessa Minnillo exited their LA gym looking like they'd just had a lover's quarrel, as they looked angry and upset after their workout, on Thursday afternoon.

It was recently reported that the former 98 Degrees singer was flirting with a blonde and a brunette at the Sundance Film Festival, and even ended up exchanging numbers with the mystery blonde, according tofo In Touch.

Vanessa was not at the star-studded event with her hubby, opting instead to stay in LA at their newly-purchased dream home in Encino, Calif.

After being married for just six months, could news of Lachey's recent trip have caused a rift in the couple's relationship?

Is she a runaway new bride??

Vanessa Minnillo was in a hurry to get to the salon on Sunday! The TV hostess jaywalked (or ran!) her way across the street as to get her hair done, then ran errands in Los Angeles.

Be careful, Vaness! Jaywalking in LA will get you a $500 ticket!

We're waiting for the news that Vanessa is pregnant! She and hubby Nick Lachey have been open about trying to become parents. Vanessa's Twitter profile now reads, "Host by day, Wifey by night, Wanna-be Mommy all the time."

Nick Lachey and Vanessa Minnillo are the hottest newlyweds around! The tanned twosome arrived at LAX from their sexy honeymoon in St. Barts.

We're loving the couples' easy, breezy style ... Vanessa's maxi dress and Nick's khaki shorts.

The couple tied the knot back on July 15, and of course, it will be televised on TLC's upcoming special, Nick & Vanessa's Dream Wedding ... airing July 30. Mark your calendars!

See more of the newly married couple making their way through LAX ... after the jump.

Nick Lachey, 37, and Vanessa Minnillo, 30, married last Friday in an intimate tropical ceremony in front of only about 30 family and friends. But, their wedding will be available for all to see in their upcoming TLC special - and now, the trailer for Nick and Vanessa's Dream Wedding is out.

In the spot, Nick tells cameras:

"It's Vanessa's day. Whatever fantasy -- whatever dream wedding she has in her head -- I want to do whatever I can to make that happen."

Adorable! It's no surprise that Vanessa reveals her inner thoughts on Nick are: "Yes! I got the guy."

The special airs July 30th and will show both preparation for the wedding and the ceremony itself. Will it take up your Saturday night?

Vanessa Minnillo looked like an anxious future bride as she made her way to the Monique Lhuillier boutique in LA on Thursday.

Nick Lachey's fiancé arrived between 3 – 6 pm, and an X17 photographer tells us:

"Vanessa looked stunning as she entered the Beverly Hills boutique. She seems so excited and like she really wanted to make this a special day."

Nick and Vanessa have been dating since 2006, with a brief split in 2009. The 98 Degrees singer popped the question near a beach in California, with a huge Asscher-cut diamond ring, flanked with trapezoids.

Will Nick beat ex-wife Jessica Simpson to the Alter?

Vanessa Minnillo and her sexy man Nick Lachey announced their engagement last November, and judging by their body language, it looks like these two are still heading towards the altar. With those sexy legs, we're not surprised Nick is smitten with the gorgeous brunette.

The couple dined at BOA Steakhouse in West Hollywood, and on the way out, Nick held on tight to his stunning fiancee.

During a recent appearance on The Rachel Ray Show, Vanessa opened up about her wedding plans. She told Rachel:

"I always feel irresponsible, like I'm unprepared for my test at school. We have nothing yet, except for the wedding planner. If I let Nick plan the wedding it'll be around some sporting event. We'll have a big old tailgate party with Miller Light! We'll have University of Cincinnati Bearcats running around!"

Sounds like a plan to us!

Vanessa also talked about how surprised she was when Nick proposed. Read what she told Rachel about that big moment ... after the jump.

Hmm, did the engaged couple get their eras wrong?

Actress Eva Longoria turns 36 on March 15th, but last night she celebrated early with a costume birthday party at Beso in Hollywood...

Kim K. Tweeted some pics from the evening - check 'em out below!

Courtesy of Kim Kardashian's Twitter

Along with the caption, "Celebrating the glamorous @EvaLongoria's bday 1920's style!"

But it looks like Nick Lachey went in 70s clothes and ladylove Vanessa Minnillo in 80s? Take a look below the cut of Kim K. with Heidi Klum, who was also at the party... in a 20s-themed costume.

Vanessa Minnillo met a pal for lunch today an literally stopped traffic in her short dress and platform boots. When Nick Lachey's bride-to-be ran across the street (jaywalking) to get to her car, she had NO problem making it across, as a couple of male drivers gladly let her pass.

We bet Ms. Mannillo will choose a show-stopping wedding gown too -- and with a bod like that, there are bound to be a few jealous boys watching when Nick kisses his bride!