A source told RadarOnline.com: "Hailey is clearly cutting ties with Justin and making a point of going on solo outings, but this was such a glamorous party at a time when Justin is also off on his own, everyone thinks she is secretly celebrating their split."

The soirée, hosted to celebrate a collaboration between Kylie's apparel brand, Khy, and London-based designer Dilara Findikoglu, provided a perfect backdrop for Hailey to showcase her stunning figure.

Sporting a skintight cream mini dress that accentuated her toned midriff and strong décolletage, Hailey was spotted in good spirits, drink in hand, and mingling with fellow attendees. This was a welcome distraction after a tumultuous week that has many fans speculating about the couple's marital stability.