A source told ET last month that 41-year-old Tatum and 32-year-old Kravitz were dating after starting out as friends. On Monday, they both looked incredible posing separately at the Met Gala red carpet -- Kravitz turning heads in a sparkly crystal shell dress by Saint Laurent -- and they were snapped heading into the gala together.
An eyewitness tells ET that the couple was holding hands inside and that Tatum pulled a chair out for Kravitz and helped her get seated at the start of the night. They were also spotted leaving together.
The couple later attended the Alicia Keys & Cincoro Tequila after-party at Casa Cipriani, where an eyewitness says they "did not take their hands off of each other." The star-studded party -- which was also in celebration of Keys' husband, producer Swizz Beatz's 43rd birthday -- brought out A-listers like Cincoro co-founder Michael Jordan, Leonardo DiCaprio and his girlfriend, Camila Morrone, Queen Latifah, Serena and Venus Williams, Elon Musk, Ciara, Timberland and Gabrielle Union.