This sneak peek takes a look back at the drama and chaos that brought these two best friends closer together.

Snooki and Jenni decide to have one last celebration before their lives become too serious.

A fight erupts over a bachelor party when Jionni and Roger come over.

Snooki gets an ultrasound of her fetus. She and JWoww also decorate their home.

Snooki and Jenni invite their ``Jersey Shore'' roommates over for dinner.

The former roommates razz Snooki for being pregnant and engaged.

Snooki gets jealous when JWoww makes a new friend at a cooking class; Snooki volunteers at a doggie day care; JWoww and Roger's relationship hits a rough patch.

Snooki and JWoww surprise their significant others by taking them to a drag show. Also: Snooki and Jionni celebrate their engagement with their families; JWoww and Roger’s relationship troubles continue.

The ladies head to Cancun to party it up and enjoy some time in the sun. Snooki finds herself unable to let loose while pregnant, leading to a late night fight in a club.

The girls' friendship is tested on their last night in Cancun. Later, JWoww and Roger's relationship hits another rough patch, while Snooki starts to question her engagement to Jionni.

Snooki and Jionni get into an argument on his birthday over a picture on Twitter. Meanwhile, JWoww and Roger consider the future of their relationship.

The ladies get a taste of motherhood when they care for two pretend babies. Later, Snooki finds out if she's having a boy or a girl.

The girls swap boyfriends for a night. Later, they must decide if they are going to stay in Jersey City or move home with their boyfriends.

Jionni and Snooki, proud parents to be, prepare themselves for the future and have a baby shower. JWoww starts to become accustomed to living with Roger.

JWoww attempts to throw Roger hints that it's time for him to propose while Snooki is unable to cope with her pregnancy.

Snooki ends up going into early labor. JWoww is embarrassed after her father tries to makes a pass at her friends at a family barbecue.

Jenni and Roger head up north to visit Roger's family in Maine. Snooki and Jionni are putting their new baby knowledge to the test as they adjust to life as new parents.

Jenni proves to Roger that she can handle the outdoors. Roger later reveals some private information. Snooki and Jionni are left exhausted while taking care of Lorenzo.

Snooki feels like the romance is dying between her and Jionni and Roger gets upset at JWOWW for being irresponsible.

Snooki and Jionni try to get their relationship back on track, and JWOWW considers introducing Roger to her mother.

Jenni decides to introduce Roger to her mother. Jionni and Snooki spend some romantic time alone.

Roger plays some pranks on Jenni prior to his proposal.

Snooki and Jenni enjoy a girls night out while Jionni and Roger have a "Dadchelor" party.

The honeymoon is over! The aftermath of Girl's night out brings both couples to the verge of breaking up.

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Snooki and JWoww try to salvage their relationships before it's too late. The Jersey Shore roommates help celebrate JWoww and Roger's engagement.

Snooki & JWOWW meet up with Girl Code's Jessimae to talk about growing up, their relationships, and what to expect from the new season!

Snooki & JWOWW are back to making memories with an all new season. Snooki & Jionni decide it's time to get their own place, while JWOWW & Roger consider couples' therapy to solve their relationship issues.

Jenni tries to train the dogs to become service animals; Snooki and Jionni leave the LaValle basement.

Snooki searches for a babysitter for Lorenzo; Jenni and Roger take Snooki and Jionni to the haunted Pennhurst Asylum.

Snooki and Jenni have a girls weekend in Atlantic City, N.J.; the guys are left to watch Lorenzo, but Jionni gets Janis to babysit so they can play paintball.

Snooki and Jenni shop for a wedding dress; Jenni realizes she may want to get married.

Snooki is overwhelmed by the wedding planning; Jenni and Roger go to an adoption fair.

Snooki and Jenni put Roger through a baby boot camp so he can learn to care for a baby; Jionni and Roger buy Lorenzo a swing set.

Snooki and Jenni participate in a charity dog wash; Roger and Jionni plan a romantic dinner; Snooki takes a DNA test.

The gang spends a couples weekend at a dude ranch; even though the women want romance, the men spend the time pulling pranks.

Jenni's dogs take their final exam; Snooki receives the results of her DNA test; the Joeys come over for a drag party.

Snooki and Jenni have a couples' weekend with their "Jersey Shore" roommates.

The couples play the "Not Yet Wed" game with host Jessimae and answer questions about unmanly habbits, stripper names, and the grossest things they do.

Snooki and Jionni throw a party for Lorenzo's first birthday; Roger wants to know where Jenni stands on marriage.