There's just no stopping lululemon athletica (Nasdaq: LULU).

The upscale yoga gear retailer was trading as much as 14% higher today, after once again posting better-than-expected quarterly results.

Net revenue soared 56%, to $152.2 million, with earnings more than doubling to $0.30 a share. Analysts were expecting a profit of only $0.24 a share on a 49% top-line boost. Wall Street needs to snap out of its meditative pose and pay attention. This is the third consecutive quarter in which lululemon earned at least 25% more than the pros predicted.

Comps have been on a tear lately, and lululemon's fiscal second quarter was no different. On a constant-dollar basis -- important, because this is a Vancouver-based chain with stores throughout North America and even in Australia -- same-store sales soared an inspiring 31%.

Upscale athletic apparel for women remains popular, even in this dogged economy. Apparently, things aren't bad in every sector. Why else would high-end jeweler Tiffany (NYSE: TIF) begin selling designer handbags last week? How did Joe's Jeans (Nasdaq: JOEZ) -- where a pair of denim pants can set a shopper back nearly $200 -- grow its sales by 51% in its latest quarter, with a 26% spike in comps to boot? Why did Coach (NYSE: COH) double its dividend back in April?

Luxury sells, as long as you're stocking the right premium products.

In its latest quarter, lululemon posted $1,532 in sales per square foot, roughly triple what tenants at leading mall operators Taubman Centers (NYSE: TCO) and Simon Property Group (NYSE: SPG) are ringing up. How attractive does that make lululemon to a landlord? These juicy store-level metrics can't be ignored.

With just 130 stores worldwide, there is plenty of room for growth beyond the individual store performance. The retailer is planning to open another 20-25 stores next year.

Sure, lululemon's stock isn't cheap. It is trading for 35 times this year's projected earnings, and 28 times next year's analyst estimate. However, lululemon's earnings are growing a lot more quickly, and every quarterly win will find analysts ratcheting profit targets higher -- bringing forward P/E multiples lower.

It's a good place to be, regardless of how you feel about well-to-do soccer moms in pricey workout clothes.

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