The 28-year-old Oscar-winner is friends with Williams, 42, and his wife Ayda Field and has asked the couple for advice on keeping a low profile while living in LA with her partner Simon Konecki and their three-year-old son Angelo, reported Daily Mirror.
"Adele craves a quiet life, and Robbie has been a huge support to her. He totally understands where she's coming from and he's a master at going unnoticed in LA. Here everyone is on the lookout for celebrities so it's the hardest place in the world to go under the radar.
Williams and Ayda have recommended restaurants and shops to Adele, so that she can enjoy LA without being hassled by fans.