MILAN, April 24 (Reuters) - Revenues at Italian luxury group Prada rose 16% at constant exchange rates in the first quarter, driven by a jump in Miu Miu sales and continued growth in Asia.

The family-owned company posted on Wednesday sales of 1.19 billion euros ($1.27 billion), slightly above a 1.14 billion euros consensus cited by analysts, defying a slowdown across the luxury sector.

Europe and Asia Pacific, and in particular Japan, where sales were boosted by tourists, drove the sales growth, while the Americas lagged.

Among the brands, flagship label Prada's retail sales grew by 7% in the January-March period, while Miu Miu, which accounts for around 15% of total sales, posted an 89% increase.

"Over the first quarter, we delivered a solid performance in a more challenging market environment", Prada Group Chairman Patrizio Bertelli said in a statement.

"While the industry is experiencing new dynamics, we retain our ambition to deliver solid, sustainable and above market growth," Chief Executive Andrea Guerra said.

French luxury group Kering said on Tuesday it expected a 40% to 45% plunge in first-half operating profit, after first-quarter sales declined. LVMH's sales slowed down in the first quarter, with only 3% growth. ($1 = 0.9356 euros) (Reporting by Elisa Anzolin, editing by Cristina Carlevaro and Barbara Lewis)