Rivera was 33 when she drowned while on a boat trip with her four-year-old son.
Her son with Blink-182 drummer Travis Barker was born in November.
"I'm so sad because she's not here in New York with me," the "Axel F" star told Jimmy Fallon on Wednesday night (June 19).
The singer also performed a new song she wrote just for host Jimmy Fallon on Wednesday night's (June 12) show.
The singer opened up about her decade-long struggle with the rare neurological disorder in Tuesday night's (June 11) primetime NBC special.
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The time-traveling show's star predicts Taylor will surely "fall for a man in a ginger wig" when he attends her show in Scotland this weekend.
The singer/actress emerged victorious over Gumball on Wednesday night's (May 22) finale.
