EXCLUSIVE: Kate Beckinsale dating 21-year-old actor Matt Rife: See their steamy PDA!


Kate Beckinsale has a new beau!

The 43-year-old actress is dating actor and comedian Matt Rife, a source close to Beckinsale tells ET. And the couple isn't shy about their relationship -- the two were spotted kissing outside of Villa Lounge in West Hollywood, California, on Tuesday.

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Our source tells ET that Beckinsale met 21-year-old Rife through a mutual friend, and that they're "officially boyfriend and girlfriend."

"They quickly started flirting, went on their first date and it's continued since," the source says.

According to our source, Beckinsale's friends and family approve of Rife.

"Everyone in Kate's circle loves Matt and are so supportive of this relationship," the source says. "He really is the sweetest guy and makes her so happy! Her entire family thinks he is the nicest and most lovely person."

20 PHOTOS
Kate Beckinsale through the years
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Kate Beckinsale through the years
NEW YORK - APRIL 06: Kate Beckinsale and Ex. Michael Sheen are seen out in Manhattan on April 06, 2016 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) Kate Beckinsale, Lily Mo Sheen and Michael Sheen are seen in Soho on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) (L-R) Lily Mo Sheen, Michael Sheen and Kate Beckinsale on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
BEVERLY HILLS, CA - JANUARY 12: (L-R) Michael Sheen, Kate Beckinsale and Len Wiseman attends the Weinstein Company's 2014 Golden Globe Awards after party on January 12, 2014 in Beverly Hills, California. (Photo by Tommaso Boddi/Getty Images)
Kate Beckinsale and Michael Sheen (Photo by George Pimentel/WireImage)
WEST HOLLYWOOD, CA- MARCH 24: Actor Michael Sheen and actress Kate Beckinsale attend the 10th Annual Elton John AIDS Foundation InStyle Party on October 24, 2002 at the Moomba Restaurant in West Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
LONDON - FEBRUARY 4: Actress Emma Thompson and Michael Sheen, ex-husband of British actress Kate Beckinsale, arrive at the 'Sony Ericsson Empire Film Awards' at The Dorchester Hotel on February 4, 2004 in London. (Photo by Dave Hogan/Getty Images)
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
TORONTO, ON - JULY 12: Actress Kate Beckinsale and actor Michael Sheen attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada. (Photo by George Pimentel/WireImage)
Actress Kate Beckinsale and actor Michael Sheen with daughters attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada.
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
Michael Sheen and Kate Beckinsale during 2001 My VH1 Awards - Arrivals at Shrine Auditorium in Los Angeles, California, United States. (Photo by Jeff Kravitz/FilmMagic)
(GERMANY OUT) 1973Schauspielerin; Grossbritannienmit ihrem Lebensgefährten, dem britischen Schauspieler Michael Sheen, bei der Deutschlandpremiere des Kinofilm 'Pearl Harbor' in Berlin auf dem Flughafen Tempelhof (Photo by Christian Bach/ullstein bild via Getty Images)
LOS ANGELES - DECEMBER 2: Actress Kate Beckinsale and actor Michael Sheen attend the Second Annual My VH1 Music Awards on December 2, 2001 at the Shrine Auditorium in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Kate Beckinsale & Michael Sheen (Photo by SGranitz/WireImage)
Michael Sheen and Kate Beckinsale during 'Romeo & Juliet' - London Premiere - Arrivals at Leicester Square in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Michael Sheen and Kate Beckinsale during The Evening Standard Theatre Awards 1998 at The Savoy in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Kate Beckinsale & Michael Sheen Attend The 'Haunted' Premiere In London. (Photo by Antony Jones/UK Press via Getty Images)
Kate Beckinsale and boyfriend Michael Sheen (Photo by Tom Wargacki/WireImage)
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"He is very mature for his age and is a great guy," the source adds.

ET has reached out to Beckinsale's rep.

Rife is best known for appearing on Nick Cannon's MTV sketch comedy show, Wild 'N Out. And judging by his Instagram account, clearly, Rife and Beckinsale share a passion for fitness.

... And a penchant for modeling.

Interestingly enough, Beckinsale portrays an older woman seducing a younger man in her next movie, The Only Living Boy in New York.

NEWS: Kate Beckinsale Says She's 'Never Actually Had an Entire Glass' of Alcohol

Beckinsale split from director Len Wiseman after 11 years of marriage in November 2015. The actress also has an 18-year-old daughter, Lily, from her previous relationship with actor Michael Sheen.

In April, both Beckinsale and her lookalike daughter showed off their toned bikini bods while on an amazing tropical vacation.

-- Reporting by Jennifer Peros

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