Rihanna, Chris Brown Celebrate with Marijuana-Adorned Cake and More Celebrity News

The singer celebrated her 25th birthday in Hawaii with her friends and family. Also, Rob Kardashian gained 50 pounds

Before we head into the biggest awards show of the year, let's look back at the week in celebrity sightings. 

Restaurant Buzz

Jessica Chastain and a slew of Oscar nominees headed to a pre-awards show dinner at The Four Season Hotel's restaurant, Culina. [US]

Kristen Stewart and friends had dinner at En Sushi in Los Feliz, Calif. [Popsugar]

Josh Duhamel and pregnant wife Fergie headed to C Restaurant in London for a dinner date. [Popsugar]

Kate Beckinsale had dinner at Scott's restaurant in London. [Just Jared]

90210's AnnaLynne McCord headed to Los Angeles' Spago to celebrate the birthday of French Canadian designer Lloyd Klein. [Just Jared]

Apparently Taylor Swift has moved onto a new conquest: singer Tom Odell. The two were spotted at a pub in London before heading to members-only Groucho Club. [E!]

Seen and Heard

Seth Green took a photo of a nacho cheese dispenser button that reads "push for cheese" and captioned the photo "best button ever." We agree, Seth. We agree. [WhoSay/SethGreen]

Brooke Burke snapped a photo of herself and a hefty glass of red wine with the caption, "sometimes you just need a glass." [WhoSay/BrookeBurke]

After gaining some 50 pounds over the course of a year, Rob Kardashian kick-started a serious diet and exercise regimen by snapping photos of his healthy breakfasts including oatmeal, strawberries, and grapefruit. [Instagram/RobKardashian]

Hailee Steinfeld snapped a photo of her afternoon snack: a banana. [Instagram/HaileeSteinfeld]

Rihanna celebrated her 25th birthday in Hawaii with her brother, friends, and on-again boyfriend Chris Brown. At her party a bright and bold two-tiered cake adorned with gold marijuana leaves was rolled out with a 25 sparkler topper. [E!]

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Julia Louis-Dreyfus claimed her goods in the refrigerator at her office. [WhoSay/JuliaLouisDreyfus]