Kate headed off on her solo excursion in the afternoon while dressed casually in black and white.
They added: "They quickly started flirting, went on their first date and it's continued since".
"Everyone in Kate's circle loves Matt and are so supportive of this relationship", one source told "Entertainment Tonight". "I really love his girlfriend as well, and we are really lucky that we both get on, and Lily gets on great with her", said Kate. "Her entire family thinks he is the nicest and most lovely person", the person added.
The Underworld actress split up with director Len Wiseman in 2015, after 11 years of marriage. Beckinsale and Wiseman have no children, but she shares an 18-year-old daughter with ex Sheen.
Protesters gather in front of Mitch McConnell's office for 'die
ADAPT organizer Bruce Darling said: 'Our lives and liberty shouldn't be stolen to give a tax break to the wealthy. Some of the protesters were yelling "no cuts to Medicaid" as they were being led away by police.
Despite being linked to the Underworld actress, very little was known about Rife up until that steamy kiss. "She is dating and having fun", a source told People. "The age difference doesn't matter to her. Matt is awesome to her". To learn more about Kate Beckinsale's boyfriend, read our Matt Rife wiki for all the details.
Rife, who has appeared on Nick Cannon's TV comedy series Wild 'N Out, appears to have teased his relationship with the sexy British beauty on social media. Wiseman, who Wednesday the British star in 2004, previously filed his own divorce papers last October.
Interestingly enough, Beckinsale portrays an older woman seducing a younger man in her next movie, The Only Living Boy in NY.
Rife was vocal about his older girlfriend in a now deleted Instagram post. Find someone you love, and take their breath away.even if that means putting a kink in their oxygen tank cord.
This week he put a perfectly timed post on Instagram: 'Age is just a number...