new poster promoting the E! show's fourth season.

The promo ad shows Kim, Kourtney and Khloe Kardashian posing in revealing black lingerie.

Teasing, "What a difference a year makes," the poster highlights Kourtney's pregnant belly, newly married Khloe's sparkling wedding rings and Kim's most famous asset -- her bootyKourtney Kardashian celebrated her "sleek, chic and elegant" baby shower with 80 guests at the weekend. The expectant mother - who is due to give birth to her first child with boyfriend Scott Disick in December - was delighted with the bash which was hosted by her sisters Kim, Khloe, Kylie and Kendall and mother Kris Jenner. The party at the family's Beverly Hills mansion saw a string of high society pals including jewelry designer Brittny Gastineau and Kris' good friend, comedian Heather McDonald. Guests enjoyed a Chinois salad and chocolate-dipped strawberries as 30-year-old Kourtney was handed luxury gifts from her pals. But her guests didn't go home empty-handed either - they were given Le Sport Sac weekender bags filled with We Pilates shirts and scarves, a bottle of Essie nail polish in a limited edition colour called "Little Baby Dash", a hand-blown glass personal tea set from Primula; a gift card from Sheila Kelley S Factor and an Alex and Ani expandable bracelet. The celebration was on Saturday