Ellie Goulding delivered a surprise performance at Nylon’s star-studded soirée celebrating Miami Art Week just days after revealing she is expecting baby No. 2 .

The very pregnant British pop star belted out several of her hits during the special set at Nylon House, presented by e.l.f. Cosmetics on Miami Beach Friday.

“She looked incredible and put on such a good show,” one partygoer tells Page Six, sharing that the singer wasn’t trying to hide her bun in the oven.

Goulding, 38, delivered songs like “Lights,” “Burn,” and “Outside” in a skin-tight mesh-and-sequin number that highlighted her growing bump.

She was stationed behind the DJ booth, where fans surrounded her with their cameras up, capturing every moment of the private gig.

“The crowd went crazy when she sang ‘Love Me Like

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