Kristin Cavallari is such a busy mamma-to-be!

The reality star had that pregnancy glow as she stepped out in a slinky jumpsuit to do some shopping and pick up some grub, before making her way to a gym in West Hollywood, on Friday afternoon.

Cavallari was in the middle of planning her big wedding to on-again finacé, Jay Cutler, last month when she suddenly found out she was expecting!

Now the former Hills star is putting her wedding plans to the Chicago Bears player on hold until after she has the baby, telling Celebuzz. "I’m not even looking for a wedding dress right now. I’m pregnant! I’m not going to go try on wedding dresses."

Sounds like Kristin may have to wait until 2013 to finally have her Big Day!

Pregnant Kristin Cavallari is hardly showing just yet, but concealed her tiny bump underneath a big sweater and a long scarf, while grabbing a green drink at Peet's Coffee in Beverly Hills, on Tuesday afternoon.

The former Laguna Beach star has decided to put off her wedding to Chicago Bears quarterback Jay Cutler until after the baby is born, telling Celebuzz, "I’m not even looking for a wedding dress right now. I’m pregnant! I’m not going to go try on wedding dresses."

Cavallari also revealed that she's received well wised from some of her former Hills cast mates. The star also received well-wishes from a few of her former Hills co-stars, revealing, "Heidi and Spencer [Pratt] actually sent me flowers, which was really sweet."

Kristin Cavallari is pregnant with her first child, and this petite star will probably not be showing for awhile! She and her fiance Jay Cutler have been together since August 2010 and announced the pregnancy over the weekend.

Ms. Cavallari, wearing a stunning black trench and black tights, was all smiles as she left the Petit Ermitage hotel in West Hollywood.

The blonde fashionista might as well enjoy wearing her Christian Louboutin boots now because soon enough, she'll be trading those in for some flats. Well, unless she pulls a Victoria Beckham and rocks stilettos until her due date.

See more of Kristin's first appearance since announcing her pregnancy in our gallery below.

Kristin Cavallari is pregnant with off-again-on-again fiance Jay Cutler. The couple released a statement to People Magazine, confirming the happy news: "We are thrilled to announce we are expecting our first child together. It's an amazing time in our life and we can't wait to meet the new addition to our growing family."

The pair met in August 2010 and after just eight months of dating, Cutler, 28, proposed to Cavallari, 24, during a vacation in Cabo San Lucas, Mexico.

Then, three months later, the couple called off their engagement and the Dancing With the Stars and Laguna Beach alum sent back her wedding gifts. It didn't take long for the Chicago Bears quarterback to get his girl back, however. The NFL star and Cavallari announced the nuptials were back on in November.

The engagement is back on, and so is Kristin Cavallari's smile!

The Hills hottie and Chicago Bears quarterback, Jay Cutler, have literally been attached at the hip since getting back together last month, and they shared a big laugh while heading to diner at Cleo in Hollywood, on Thursday night.

Now that they're finally ready to move ahead with the lavish wedding plans, it seems the 24-year-old reality star will be completely in charge of the entire event. "Whatever she wants to do, I'm on board," the NFL player recently expressed.

As far as their breakup goes, Cavallari admits she's happy it worked out the way it did, confessing to People mag: "Sometimes, in order for things to get better, they have to end – even if it's momentarily, and that was the case with us."

Kristin Cavallari was spotted leaving M Cafe on Melrose today, and the former Hills hottie showed off her glowing skin -- and that fabulous 5.2 carat rock! -- when we snapped her picture.

While Kristin seems thrilled that her engagement to NFL star Jay Cutler is back on, we're sad to report that she won't be spending her whole holiday vacation with her beau. "I won't be with him Christmas Eve or Christmas, but I'll be with my mom and that whole side of my family," Kristin told Us Weekly on Monday. "Jay, unfortunately, is playing in Green Bay on Christmas Day." Boo! This is the first holiday that the couple has spent apart, "so obviously it won't be great," she added. "But it is what it is."

But hey, there's still New Year's Eve, right? Hopefully these two get to stand under the mistletoe for that one!

The e-ring is officially back on!

Looking every inch the seventies sweetheart in a floppy felt hat, black bellbottoms and a furry vest -- plus Christian Louboutin heels and an Alexander Wang bag -- Kristin Cavallari flashed her 5.2 carat engagement ring as she treated herself to a shopping trip in Malibu, on Sunday.

The Dancing with the Stars alum has had a very emotional year after calling off her engagement with NFL star Jay Cutler, before getting back together late last month.

Now the former Hills star is throwing herself back into the wedding planning full-force, but don't expect the Chicago Bears player to pitch in with any of the wedding plans!

Cutler confessed on ESPN's Waddle & Silvy radio show: "I don't really make a lot of (wedding) decisions. I hear about them in passing, or if I have to possibly write a check or something like that, but other than that, whatever she wants to do, I'm on board."

Second time's the charm?

After calling off their three-month engagement back in July, Kristin Cavallari and Jay Cutler are engaged again! "Kristin is over the moon with happiness," a source tells Life & Style. "She's already told her friends that the engagement is back on. They haven't set a new date yet."

After approximately 6 months of dating, Jay proposed while the lovebirds were on vacation in Mexico last April, but they split due to their busy work schedules. Kristin and Jay rekindled their romance when she began competing on Dancing With the Stars in September, so it seems like she'll get to have her dream wedding after all!

UPDATE: Kristin is NOT engaged! She tweeted today, "New week new rumor. I'm not engaged u guys."