As if this blindingly sunny NYC day wasn’t enough to remind you that yes, spring is finally here, last night’s park-themed soiree celebrating Stella McCartney‘s newest (and first) shop in Saks Fifth Avenue seemed to drive the point home. Amidst a cotton candy machine and swings, Stella-clad models mingled with guests on the astro-turfed floor, their bouquets of white and silver balloons bobbing well above the crowd’s heads. And we have to say, we can’t think of a more fitting way to showcase McCartney’s playful motifs this season, from the confetti-like sheer dresses to the oversized, juicy-looking fruit prints.

But while the mood was festive, both McCartney and co-host Liv Tyler turned serious when asked about the Costume Institute’s McQueen exhibit at the Met: “The exhibition is exquisite,” said McCartney “He was a good friend of mine for a long time.” Tyler said. “[So the event] was very sad, but also very beautiful.” She added, with a thoughtful laugh, “He would have thought that night was so, so amazing.”

Still, it was hard to be somber on such a celebratory night.