Rihanna's got motherhood on the brain in the sweetest way! On Tuesday, the 34-year-old singer sent a special shout-out to her mom, Monica Braithwaite, on her Instagram page, and opened up about how her pregnancy has given her a new appreciation for her mother.«Today is my Queen's birthday!!!» she captioned the throwback photo of the two. «Being on the verge of motherhood, unlocked new levels of love and respect I have for my mommy in a way that I could never explain! She's the true MVP and I wanna give her her flowers every second I can! Love you mumzzzz!!! Happy Birthday! We gon celebrate on da link up!»A post shared by badgalriri (@badgalriri)The FENTY Beauty founder announced she is expecting her first child with boyfriend A$AP Rocky in January. Since then, she's had her baby bump on display and putting her own twist on maternity styles during date nights, fashion shows and even trips to the Target baby department. In a recent interview with , the singer shared her plans for her future life as a mom, revealing that she's entered her third trimester.«There's a pregnancy glow.