Rihanna went all out for her mom Monica Braithwaite’s 52nd birthday.

Following a celebration with caviar and champagne at Pastis on Monday, spies tell us the pop icon and her mom dined at Nobu downtown on Tuesday.

“It was just the two of them,” said the spy. At least, mostly. “A bodyguard stood a few feet away.”

“She kept calling her mom ‘sister,’” the source continued. “They ate a lot of sushi. Rihanna seemed really pleasant and friendly and took pics with some fans.”

The night before, after quietly attending an anti-Asian hate rally in Manhattan, the Fenty Beauty founder celebrated her mother with her grandparents and brother. A source told Page Six there were nine people in their party, since 10 is the maximum capacity per the city’s indoor dining mandate.