He has his mother's smile! Jennifer Garner enjoys a day at the park with beaming baby son Samuel

Jennifer Garner and Ben Affleck yesterday showed off baby son Samuel for the first time while attending a Fourth of July parade.
And today the 18-week-old tot enjoyed a trip to the park with his famous mother and his sister Seraphina.
Samuel couldn't stop smiling as he played in the sunshine and the youngster already bears a striking resemblance to Jennifer.

Striking resemblance: Samuel Affleck is shaping up to be the spitting image of his mother Jennifer Garner

As he beamed away and Jennifer followed suit, it became clear that Samuel has inherited his mother's smile.
Samuel was well-protected against the warm weather in a sunhat and also sported a sweet striped onesie.
Seraphina also seemed to be having a great time as she and Jennifer played on the slide that the park's playground had to offer.

Beaming baby: The 18-week-old couldn't stop smiling as he enjoyed a trip to the park

Family day out: Seraphina also joined her brother and mother for some fun in the playground

Let it slide: Jennifer and Seraphina took turns trying out a yellow slide

Samuel, who was born February 27, and his two sisters yesterday joined their superstar parents at a Fourth of July bash near their Los Angeles home.
And the happy bunch looked every inch the all-American family as they made the most of the holiday.
The couple dressed down for their day out with Violet, six, and three-year-old Seraphina, who waved pom poms and ate cotton candy as doting dad Ben captured the moment on camera.

He's adorable!: Jennifer and Ben yesterday debuted their baby son Samuel

Spitting image: Samuel appears to already be taking after his stunning parents in the looks department

The pair looked enamoured with each other as they enjoyed their family day out.

Throughout the day the 39-year-old actor stood behind the lens, snapping photos of Jennifer and their girls cheering as the parade rolled by.

Family fun: Samuel joined his parents and sisters at a Fourth of July parade

Making his debut: Yesterday was the first time Samuel has been seen since his February 27 birth

Close bond: Jennifer carried her 18-week-old son on her hip as they made their way to the bash

Violet and Seraphina excitedly waved red, white and blue pom poms - Seraphina at one point giggling with star-spangled ribbons in her hair as she sat on her mum's hip.

Both girls were dressed in patriotic colours with Violet in a red and white striped skirt and blue T-shirt, her blonde hair braided in pig tails down her back. 
Seraphina donned a similar frock, a blue and white striped dress that matched her hair bows.

Happy together: Ben Affleck and wife Jennifer Garner step out to attend the local July Fourth parade in Los Angeles with their girls Violet, six, and Seraphina, three

Star couple: Ben captured their little moments on camera as Seraphina giggled and cheered

Tired darling? Seraphina appeared a little disgruntled after a full day out

Their mum and dad wore white T-shirts and denim, watching the performers in the street from a raised platform in the crowd.

And Jen, while sporting her usual make-up free face, looked hardly her 40 years as she flashed a smile and kissed her husband on the cheek.

Ben took Violet by the hand in one adorable snap, the dimpled six-year-old holding out her sticky fingers from snacking on cotton candy, while Jennifer carried Seraphina, who adorably had blue sticky sweets all over her face.

Stealing kisses: Jennifer snuck a tender kiss in with Ben as the parade rolled by

Her sweets: The girls chomped on cotton candy in their patriotic outfits

Their leading man: Ben played the part of the all-American dad on the family outing near their Pacific Palisades home

The family is presumably enjoying the sites near their Pacific Palisades home before they are expected to jet to Puerto Rico.

Ben is believed to be filming his latest project, Runner Runner, with Justin Timberlake on the Carribbean island.

The family will likely be making the trip together as Ben recently applied for a passport for little four-month-old Samuel.

Sticky hands: Ben grabbed Violet's wrist as she stuck her fingers out after eating handfuls of cotton candy

Family time: Seraphina was adorable with blue cotton candy all over her face, while Ben tried not to touch his daughter's stick hands as they returned home